Syed Ahmed Zaki

package com.zakilive;

import java.util.ArrayList;

public class Main {

    public static void main(String[] args) {
	// working with arraylist

        ArrayList words=new ArrayList<>();
        words.add("hello"); //string
        words.add("there");
        words.add(9); //integer
        words.add(12.00); //double
        words.add('H'); //character

        int item1= (int) words.get(2);
        double item2= (double) words.get(3);
        String item3= (String) words.get(0);

        System.out.println(item1+item2);


    }
}

package com.zakilive;

import java.util.ArrayList;

public class Main {

public static void main(String[] args) {

// working with arraylist

ArrayList words=new ArrayList<>();

words.add("hello"); //string

words.add("there");

words.add(9); //integer

words.add(12.00); //double

words.add('H'); //character

int item1= (int) words.get(2);

double item2= (double) words.get(3);

String item3= (String) words.get(0);

System.out.println(item1+item2);

}

Generics:

package com.zakilive;

import java.util.ArrayList;
import java.util.LinkedList;

public class Main {

    public static void main(String[] args) {
	// working with arraylist

        ArrayList<String> words=new ArrayList<String>();
        words.add("hello"); //string
        words.add("there");
        words.add("9"); //integer
//        words.add(12.00); //double
//        words.add('H'); //character

//        int item1= (int) words.get(2);
//        double item2= (double) words.get(3);
        String item3= (String) words.get(2);
        System.out.println(item3);

//        System.out.println(item1+item2);
        LinkedList<Integer> numbers=new LinkedList<Integer>();
        numbers.add(100);
        numbers.add(200);
        numbers.removeFirst();

        for(int number: numbers)
        {
            System.out.println(number);
        }

    }
}

package com.zakilive;

import java.util.ArrayList;

import java.util.LinkedList;

public class Main {

public static void main(String[] args) {

// working with arraylist

ArrayList<String> words=new ArrayList<String>();

words.add("hello"); //string

words.add("there");

words.add("9"); //integer

// words.add(12.00); //double

// words.add('H'); //character

// int item1= (int) words.get(2);

// double item2= (double) words.get(3);

String item3= (String) words.get(2);

System.out.println(item3);

// System.out.println(item1+item2);

LinkedList<Integer> numbers=new LinkedList<Integer>();

numbers.add(100);

numbers.add(200);

numbers.removeFirst();

for(int number: numbers)

{

System.out.println(number);

}

LinkedList is faster for manipulation but slower for retrieval and ArrayList is slower for manipulation but faster for retrieval

Leave a comment

Posted in Data Structure, Java

Data Mining: Unit 9

Posted on July 3, 2020 | Leave a comment

Ensemble Models:

Basics
Boosting
Ranmdom Forests

Support Vector Machines
Basics
Linear Classification
Nonlinear Classification
Properties of SVMs

Discriminant Analysis
Basics

Exercise:

We are going to create some data mining models for classification and compare their performance. The goal with our models is still.

Leave a comment

Posted in Data Mining, Data Mining

Data Mining: Exercise 8

Posted on July 3, 2020 | Leave a comment

Design of network topology

Determine:

Number of input nodes
Too few nodes => misclassification
Too many nodes=> overfitting

Problems with dollar sign:

https://stackoverflow.com/questions/42560090/what-is-the-meaning-of-the-dollar-sign-in-r-function

Problem with tilde sign:

https://stackoverflow.com/questions/14976331/use-of-tilde-in-r-programming-language?noredirect=1&lq=1

Leave a comment

Posted in Data Mining, Data Mining

Java serious OOP Practice

Posted on July 1, 2020 | Leave a comment

Problem statement: Write a program to simulate a car dealership sales process. We will have employees, working selling vehicles to customers.

you have to think about nouns(a person, name or thing) while doing OOP, we have 4 nouns in the problem statement.

Dealership.java

package com.zakilive;

public class Dealership {

    public static void main(String[] args)
    {

        Customer cust1=new Customer("Tom", "123 Anything st", 25000); //cust1 is a variable
//        cust1.setName("Tom"); //cust1 is referencing the things on heap
//        cust1.setAddress("123 Anything st");
//        cust1.setCashOnHand(25000);

//        Vehicle vehicle=new Vehicle("Honda","Accord", 15000); //we are passing through constructor
//        vehicle.setMake("Honda");
//        vehicle.setModel("Accord");
//        vehicle.setPrice(15000);

        Vehicle vehicle = new Vehicle("BMW","M3",20000);

        Employee emp=new Employee();

        cust1.purchaseCar(vehicle, emp, false); //false

        Vehicle car=new Vehicle("BMW","M3",20000);

        boolean value=car.equals(vehicle);
        System.out.println(value);

        /***
         *
         * handleCustomer(Customer cust, boolean finance, Vehicle vehicle)
         *  if(finance==true)
         *      runCreditHistory(Customer cust, double doubleAmount)
         *  else if(vehicle.getPrice()<=cust.getCashOnHand()):
         *      processTransaction(Customer cust,Vehicle vehicle)
         *   else:
         *      tell customer bring more money
         *
         *
         * //getters allow us to encapsulate data
         *
         */


    }

}

package com.zakilive;

public class Dealership {

public static void main(String[] args)

{

Customer cust1=new Customer("Tom", "123 Anything st", 25000); //cust1 is a variable

// cust1.setName("Tom"); //cust1 is referencing the things on heap

// cust1.setAddress("123 Anything st");

// cust1.setCashOnHand(25000);

// Vehicle vehicle=new Vehicle("Honda","Accord", 15000); //we are passing through constructor

// vehicle.setMake("Honda");

// vehicle.setModel("Accord");

// vehicle.setPrice(15000);

Vehicle vehicle = new Vehicle("BMW","M3",20000);

Employee emp=new Employee();

cust1.purchaseCar(vehicle, emp, false); //false

Vehicle car=new Vehicle("BMW","M3",20000);

boolean value=car.equals(vehicle);

System.out.println(value);

/***

* handleCustomer(Customer cust, boolean finance, Vehicle vehicle)

* if(finance==true)

* runCreditHistory(Customer cust, double doubleAmount)

* else if(vehicle.getPrice()<=cust.getCashOnHand()):

* processTransaction(Customer cust,Vehicle vehicle)

* else:

* tell customer bring more money

* //getters allow us to encapsulate data

}

Customer.java

package com.zakilive;

public class Customer {
    private String name;  //this are only accessible in this class
    private String address;
    private double cashOnHand;

    public Customer(String name, String address, double cashOnHand) {
        this.name = name;
        this.address = address;
        this.cashOnHand = cashOnHand;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }


    public double getCashOnHand() {
        return cashOnHand;
    }

    public void setCashOnHand(double cashOnHand) {
        cashOnHand+=500;
        this.cashOnHand = cashOnHand;
    }


    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        address+="Dealership City";
        this.address = address;
    }


    public void purchaseCar(Vehicle vehicle, Employee emp, boolean finance) //method signature
    {
        emp.handleCustomer(this, finance, vehicle);  //"this" actually shares the instances of a class to the another class method


    }
}

package com.zakilive;

public class Customer {

private String name; //this are only accessible in this class

private String address;

private double cashOnHand;

public Customer(String name, String address, double cashOnHand) {

this.name = name;

this.address = address;

this.cashOnHand = cashOnHand;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public double getCashOnHand() {

return cashOnHand;

}

public void setCashOnHand(double cashOnHand) {

cashOnHand+=500;

this.cashOnHand = cashOnHand;

}

public String getAddress() {

return address;

}

public void setAddress(String address) {

address+="Dealership City";

this.address = address;

}

public void purchaseCar(Vehicle vehicle, Employee emp, boolean finance) //method signature

{

emp.handleCustomer(this, finance, vehicle); //"this" actually shares the instances of a class to the another class method

}

Vehicle.java

package com.zakilive;

public class Vehicle {
    private String make;
    private String model;
    private double price;

    public Vehicle(String make, String model, double price) {
        this.make = make;
        this.model = model;
        this.price = price;
    }

    public String getMake() {
        return make;
    }

    public void setMake(String make) {
        this.make = make;
    }

    public String getModel() {
        return model;
    }

    public void setModel(String model) {
        this.model = model;
    }

    public double getPrice() {
        return price;
    }

    public void setPrice(double price) {
        this.price = price;
    }

    @Override
    public int hashCode() {
        return super.hashCode();
    }

    @Override
    public boolean equals(Object obj) {
        return super.equals(obj);
    }

    @Override
    public String toString() {
        return "Vehicle {" +
                "make='" + make + '\'' +
                ", model='" + model + '\'' +
                ", price=" + price +
                '}';
    }
}

package com.zakilive;

public class Vehicle {

private String make;

private String model;

private double price;

public Vehicle(String make, String model, double price) {

this.make = make;

this.model = model;

this.price = price;

}

public String getMake() {

return make;

}

public void setMake(String make) {

this.make = make;

}

public String getModel() {

return model;

}

public void setModel(String model) {

this.model = model;

}

public double getPrice() {

return price;

}

public void setPrice(double price) {

this.price = price;

}

@Override

public int hashCode() {

return super.hashCode();

}

@Override

public boolean equals(Object obj) {

return super.equals(obj);

}

@Override

public String toString() {

return "Vehicle {" +

"make='" + make + '\'' +

", model='" + model + '\'' +

", price=" + price +

'}';

}

Employee.java

package com.zakilive;

public class Employee {

    public void handleCustomer(Customer cust, boolean finance, Vehicle vehicle)
    {
        if(finance==true)
        {
            //customer pays in loan
            double loanAmount=vehicle.getPrice()-cust.getCashOnHand();
            runCreditHistroy(cust,loanAmount);

        }
        else if (vehicle.getPrice()<=cust.getCashOnHand())   //reason for using getters is encapsulating and the data hiding objects, setters to set also for the same purpose
        {
            //customer pays in cash
            processTransaction(cust,vehicle);
        }
        else{
            System.out.println(" Customer will need more money to purchase vehicle: "+vehicle);
        }
    }

    public void runCreditHistroy(Customer cust, double loanAmount)
    {
        System.out.println("Ran credit history for customer....");
        System.out.println("Customer has been approved to purchase the vehicle");
    }

    public void processTransaction(Customer cust, Vehicle vehicle){
        System.out.println("Customer has purchased the vehicle: "
                +vehicle+" for the price "+vehicle.getPrice());

    }
}

package com.zakilive;

public class Employee {

public void handleCustomer(Customer cust, boolean finance, Vehicle vehicle)

{

if(finance==true)

{

//customer pays in loan

double loanAmount=vehicle.getPrice()-cust.getCashOnHand();

runCreditHistroy(cust,loanAmount);

}

else if (vehicle.getPrice()<=cust.getCashOnHand()) //reason for using getters is encapsulating and the data hiding objects, setters to set also for the same purpose

{

//customer pays in cash

processTransaction(cust,vehicle);

}

else{

System.out.println(" Customer will need more money to purchase vehicle: "+vehicle);

}

public void runCreditHistroy(Customer cust, double loanAmount)

{

System.out.println("Ran credit history for customer....");

System.out.println("Customer has been approved to purchase the vehicle");

}

public void processTransaction(Customer cust, Vehicle vehicle){

System.out.println("Customer has purchased the vehicle: "

+vehicle+" for the price "+vehicle.getPrice());

}

Output:
if false in purchaseCar()

Customer has purchased the vehicle: Vehicle {make='BMW', model='M3', price=20000.0} for the price 20000.0
false

1 2	Customer has purchased the vehicle: Vehicle {make='BMW', model='M3', price=20000.0} for the price 20000.0 false

if true in purchaseCar()

Ran credit history for customer....
Customer has been approved to purchase the vehicle
false

Ran credit history for customer....

Customer has been approved to purchase the vehicle

false

Leave a comment

Posted in OO Analysis and Design, OOP

Interface, Abstract Class and Polymorphism Example

Posted on June 24, 2020 | Leave a comment

Animal.java class

package com.zakilive;

public abstract class Animal {
    //defining attributes
    String name;
    int weight;
    String gender;

    public Animal(String name, int weight, String gender){   //defining constructors
        this.name=name;
        this.weight=weight;
        this.gender=gender;
    }

    //behaviours

    public void Eat(){
        System.out.println(name+" eat");
    }

    public void Sleep(){
        System.out.println(name+" Sleep");
    }

    public abstract void move(); //You cannot create instance of a abtract class


}

package com.zakilive;

public abstract class Animal {

//defining attributes

String name;

int weight;

String gender;

public Animal(String name, int weight, String gender){ //defining constructors

this.name=name;

this.weight=weight;

this.gender=gender;

}

//behaviours

public void Eat(){

System.out.println(name+" eat");

}

public void Sleep(){

System.out.println(name+" Sleep");

}

public abstract void move(); //You cannot create instance of a abtract class

}

Fish.java

package com.zakilive;

public class Fish extends Animal {

    public Fish(String name, int weight, String gender) {
        super(name, weight, gender);
    }


    public void move() {
        System.out.println("Fish is swimming");
    }

    public void Swim() {
        System.out.println(name + " also Swimming...");
    }


    public static void moveAnimal() {

    }

}

package com.zakilive;

public class Fish extends Animal {

public Fish(String name, int weight, String gender) {

super(name, weight, gender);

}

public void move() {

System.out.println("Fish is swimming");

}

public void Swim() {

System.out.println(name + " also Swimming...");

}

public static void moveAnimal() {

}

Zoo.java

package com.zakilive;

public class Zoo {

    public static void main(String[] args) {

       Animal sparrow1=new Sparrow("Bird1",9,"Male");
       sparrow1.move();


       Animal fish1=new Fish("Hilsha",99,"Male");
       fish1.move();

        moveAnimals(fish1);
        moveAnimals(sparrow1);



//        Animal animal1 = new Animal("Parrot", 20, "Male");
//        animal1.Eat();
//
//        Bird bird1 = new Bird("Parrot", 20, "male");
//        //bird1.Fly();
//
//        Animal animal2 = new Animal("Salmon", 50, "Female");
//        animal2.Eat();
//
//        Fish fish= new Fish("Salmon", 50, "Female");
//        fish.Swim();
//
//
//
//        Chicken chick1=new Chicken("Murgi",50,"Female");
//        chick1.fly();


    }

    private static void moveAnimals(Animal animal) {
        animal.move();

    }
}

package com.zakilive;

public class Zoo {

public static void main(String[] args) {

Animal sparrow1=new Sparrow("Bird1",9,"Male");

sparrow1.move();

Animal fish1=new Fish("Hilsha",99,"Male");

fish1.move();

moveAnimals(fish1);

moveAnimals(sparrow1);

// Animal animal1 = new Animal("Parrot", 20, "Male");

// animal1.Eat();

// Bird bird1 = new Bird("Parrot", 20, "male");

// //bird1.Fly();

// Animal animal2 = new Animal("Salmon", 50, "Female");

// animal2.Eat();

// Fish fish= new Fish("Salmon", 50, "Female");

// fish.Swim();

// Chicken chick1=new Chicken("Murgi",50,"Female");

// chick1.fly();

}

private static void moveAnimals(Animal animal) {

animal.move();

}

Sparrow.java

package com.zakilive;

public class Sparrow extends Bird implements Flyable {

    public Sparrow(String name, int weight, String gender) {
        super(name, weight, gender);
    }


    public void Fly(){
        System.out.println("Sparrow flying high....");
    }

}

package com.zakilive;

public class Sparrow extends Bird implements Flyable {

public Sparrow(String name, int weight, String gender) {

super(name, weight, gender);

}

public void Fly(){

System.out.println("Sparrow flying high....");

}

Chicken.java

package com.zakilive;

public class Chicken extends Bird{


    public Chicken(String name, int weight, String gender) {
        super(name, weight, gender);
    }

    public void fly(){
        System.out.println("not able to fly....");
    }

}

package com.zakilive;

public class Chicken extends Bird{

public Chicken(String name, int weight, String gender) {

super(name, weight, gender);

}

public void fly(){

System.out.println("not able to fly....");

}

Bird.java

package com.zakilive;

public class Bird extends Animal { //now bird is a child of Animal, Bird is a subclass and Animal is base class



    public Bird(String name, int weight, String gender)
    {
        super(name, weight, gender);
    }


    public void move() {
        System.out.println("Flapping wings");
    }


}

package com.zakilive;

public class Bird extends Animal { //now bird is a child of Animal, Bird is a subclass and Animal is base class

public Bird(String name, int weight, String gender)

{

super(name, weight, gender);

}

public void move() {

System.out.println("Flapping wings");

}

Flyable.java

package com.zakilive;

public interface Flyable {

    //interface only has abstract method
    public void Fly(); //interface has no body



}

package com.zakilive;

public interface Flyable {

//interface only has abstract method

public void Fly(); //interface has no body

}

Leave a comment

Posted in OO Analysis and Design, OOP

My Java OOP example from Lessons

Posted on June 23, 2020 | Leave a comment

Animal.java:

package com.zakilive;

public class Animal {
    //defining attributes
    String name;
    int weight;
    String gender;

    public Animal(String name, int weight, String gender){   //defining constructors
        this.name=name;
        this.weight=weight;
        this.gender=gender;
    }

    //behaviours

    public void Eat(){
        System.out.println(name+" eat");
    }

    public void Sleep(){
        System.out.println(name+" Sleep");
    }

}

package com.zakilive;

public class Animal {

//defining attributes

String name;

int weight;

String gender;

public Animal(String name, int weight, String gender){ //defining constructors

this.name=name;

this.weight=weight;

this.gender=gender;

}

//behaviours

public void Eat(){

System.out.println(name+" eat");

}

public void Sleep(){

System.out.println(name+" Sleep");

}

Zoo.java

package com.zakilive;

public class Zoo {

    public static void main(String[] args) {
        Animal animal1 = new Animal("Parrot", 20, "Male");
        animal1.Eat();

        Bird bird1 = new Bird("Parrot", 20, "male");
        bird1.Fly();

        Animal animal2 = new Animal("Salmon", 50, "Female");
        animal2.Eat();

        Fish fish= new Fish("Salmon", 50, "Female");
        fish.Swim();

    }
}

package com.zakilive;

public class Zoo {

public static void main(String[] args) {

Animal animal1 = new Animal("Parrot", 20, "Male");

animal1.Eat();

Bird bird1 = new Bird("Parrot", 20, "male");

bird1.Fly();

Animal animal2 = new Animal("Salmon", 50, "Female");

animal2.Eat();

Fish fish= new Fish("Salmon", 50, "Female");

fish.Swim();

}

Fish.java

package com.zakilive;

public class Fish extends Animal{

    public Fish(String name, int weight, String gender)
    {
        super(name, weight, gender);
    }

    public void Swim(){
        System.out.println(name+" also Swimming...");
    }
}

package com.zakilive;

public class Fish extends Animal{

public Fish(String name, int weight, String gender)

{

super(name, weight, gender);

}

public void Swim(){

System.out.println(name+" also Swimming...");

}

Bird.java

package com.zakilive;

public class Bird extends Animal { //now bird is a child of Animal, Bird is a subclass and Animal is base class



    public Bird(String name, int weight, String gender)
    {
        super(name, weight, gender);
    }

    public void Fly() {
        System.out.println(name+" also Flying...");
    }

}

package com.zakilive;

public class Bird extends Animal { //now bird is a child of Animal, Bird is a subclass and Animal is base class

public Bird(String name, int weight, String gender)

{

super(name, weight, gender);

}

public void Fly() {

System.out.println(name+" also Flying...");

}

Leave a comment

Posted in OO Analysis and Design, OOP

My Beautiful Crafted Java OOP

Posted on June 23, 2020 | Leave a comment

Human.java

package com.zakilive;

public class Human {

    String name;
    int age;
    int heightInInches;
    String eyeColor;

    public Human(String name,int age,int heightInInches,String eyeColor){ //special method/construcotr method same name as class, constructor has no return type
        this.age=age;   //this is a variable which is making it dynamic when it puts
        this.heightInInches=heightInInches;
        this.eyeColor=eyeColor;
        this.name=name;
    }

    public void Speak(){
        System.out.println("Hello, my name is "+name);
        System.out.println("I am "+heightInInches+" inches tall");
        System.out.println("I am "+age+" years old");
        System.out.println("My eye color is "+eyeColor);
        System.out.println("\n");
    }

    public void eat(){
        System.out.println("Eating...");
    }

    public void walk(){
        System.out.println("Walking...");
    }

    public void work(){
        System.out.println("Working....");
    }

}

package com.zakilive;

public class Human {

String name;

int age;

int heightInInches;

String eyeColor;

public Human(String name,int age,int heightInInches,String eyeColor){ //special method/construcotr method same name as class, constructor has no return type

this.age=age; //this is a variable which is making it dynamic when it puts

this.heightInInches=heightInInches;

this.eyeColor=eyeColor;

this.name=name;

}

public void Speak(){

System.out.println("Hello, my name is "+name);

System.out.println("I am "+heightInInches+" inches tall");

System.out.println("I am "+age+" years old");

System.out.println("My eye color is "+eyeColor);

System.out.println("\n");

}

public void eat(){

System.out.println("Eating...");

}

public void walk(){

System.out.println("Walking...");

}

public void work(){

System.out.println("Working....");

}

Earth.java

package com.zakilive;

public class Earth {
    public static void main(String[] args)
    {
       Human human1=new Human("Togo",23,67,"Blue");
       Human human2=new Human("Bogo",32,7,"BlueOcean");
       Human human3=new Human("Zogo",34,889,"purple");

       human1.Speak();
       human2.Speak();
       human3.Speak();
    }
}

package com.zakilive;

public class Earth {

public static void main(String[] args)

{

Human human1=new Human("Togo",23,67,"Blue");

Human human2=new Human("Bogo",32,7,"BlueOcean");

Human human3=new Human("Zogo",34,889,"purple");

human1.Speak();

human2.Speak();

human3.Speak();

}

Leave a comment

Posted in Java, OO Analysis and Design, OOP

Posted on June 22, 2020 | Leave a comment

mach= imperative form of machen
=anmachen=put on,turn on
=aufmachen=open,undo,open up
=ausmachen=put out, turn off, make out
= mitmachen=join in, take part in
=zumachen=close,shut down
=klarmachen=explain,make clear

anfang=beginning
am anfang=at the begininning
anfang Mai=early in May

vernahm=heard
Geräusch=noise
verdächtige=suspect
verlassen = leave,exit,quit
gestohlener = stolen
entdeckte= discover
kippte =Tip given
entschlossen = Determined
Kübel =Bucket
Dieb=Thief
fassen=take
aufregend = exciting
ausnahmsweise = exceptionally

hinlegen
hingelegt=lay down, settle down
eingebildet
herausstellte=emphasize
ungewöhnliche = unusual, uncommon

Na warte mal=wait a minute
sprang=jump
gefreut = happy
gestört =disturbed
geil=hot

tatsächlich = Indeed, in fact
entdeckte = discover
beschloss = decided, resolve
einbrach
gerade =just

Empfindung = sensation, perception, feeling, emotion

bezeichnen-Denote,constitute,name,signify
wörtlicher-literal,verbal

Darstellung=Presentation, exposition
inneren = Interior
Monolog-
Trauen=Sad
Pochte
pochen=Knock
Wieder = again
Einatmen= breathe in

Sachtexte verstehen-Understanding the factual texts
Etwas definieren-Define Something
Meinungen äußern-Express opinions

Leave a comment

Posted in German Learning

German Word Learning

Posted on June 18, 2020 | Leave a comment

Sternlein
Schafelein
Schenk
Schelle
Spielgeselle
Lammerlein
Schelle
Umfrage
Vertraumt
Vorgange
häufigsten
verstorben
altagstresse
Abstürzen
Gedanken
grummelt zwar der Volksmund
Dennoch
Traumforscher
errechnet
Befragt
Ebenfalls
wurdest
Zwar
anschauen
Schaum
entfernt
Wie heißt das so schön?
niemand
daraus
jeweils
dass
das
etwa
bemerkt
das
fähig
echt
echt

Leave a comment

Posted in German Learning, Germany

Unit 5- Multiple Linear Regression

Posted on June 15, 2020 | Leave a comment

iT IS HAPPEN WHEN MORE THAN ONE POSSIBLE PREDICTOR VARIABLE.

including more than one independent variable in the regression model, makes us extend the simple linerar regression model to a multiple linear regression model.

Advantages:
Relationship between response variables and several predictors simultaneously.

Disadvantages:
Model building , interpration difficulties due to complexity.

Multiple linear regression with two predictors:

Y=beta0+beta1X1+beta2X2+epsylon
where, Y is the dependent variable.
X1,X2…Xk are predictors(independent variables)
Epsylon is the random error
beta1, beta2, beta0 are unknown regression coefficients

Example=> oil consumption:

Y=oil consumption(per month)
X1=outdoor temperature

X2=size of house(in meter square)

Model:

Y=beta0+beta1X1+beta2X2+epsylon

now beta1 is expected change in Y(oil consiumption) at one unit increase in X1(outdoor temperature), when all other predictors are kept constant, i.e. in this case the size of the house is not changed.

beta1 is estimated with beta1=-27.2 degree C

Assumptions:

The random error term epsylon is normally distributed and has mean zero. i.e. E(epsylon)=0

Epsylon has (unknown) variance sigma epsylon^2. i.e. all random errors have the same variance.

Adjusted R^2
R^2adj=1- SSE/(n-k-1)/SST/(n-1)

As for simple linear regression:

plots of residual against y prime
plots of residuals against xi
normal probability plot of residuals
plots of residuals in observation order
Cook’s distance
Studentized residuals
Standardized residuals
Dffits

Collinearity:
Can only occur for multiple regression.
Predictors explaining the same variation of the response variabl.

Oil consumption continued:
One predictor measuring house size in cm^2 and another predictor in m^2
Variance inflation factor

VIFi=1/1-Ri^2

Condition Index for collinearity:
between 10 and 30=>weak collinearity
between 30 and 100=>moderate
collinearity>100=>strong collinearity

Example of Oil consumption continued:
Assume that we would like to use outdoor temperature X1 and house size X2 as predictors. Additionally, we want to use a third predictor:

X3={1 if extra-thick walls, 0 otherwise

Model:
Y=beta0+beta1X1+beta2X2+beta3X3+epsylon

Model Selection Strategies:
Mldel ranked using R^2, adjusted R^2 or mallow’s Cp
Stepwise selection methods:
Backward, forward, stepwise selection

r^2 Selection
In a data set with 7 possible predictors, there would be 2^7-1=127 possible regression models.
For every model size(k=1,2,…..,p) look at, let say, m models, chosen

Mallow’s Cp:
Large Cp=>biased model
it’s a formula.
where MSEp=mean squared error for a model with p parametes
mean squared error for the full model
n=number of observations

Leave a comment

Posted in Data Mining, Data Mining

Design Pattern and Object oriented Data Analaysis

Posted on June 13, 2020 | Leave a comment

Writing here to clearing engineering concept of a software for future reference.

Example for Class, Constructors and Methods:

Main.java

public static void main(String[] args)
{
User user=new User("Zaki",30);
//user.name="Zaki";

//System.out.println(user.name);
user.sayHello();
}

public static void main(String[] args)

{

User user=new User("Zaki",30);

//user.name="Zaki";

//System.out.println(user.name);

user.sayHello();

}

User.java

public class User{
	//defining the attribute
	public String name;
		
	//constructor creation
	public User(String name, int age){
		this.name=name;
	}
	
	//method creation
	public void sayHello{
		System.out.println("This is "+name);
	}
	
	//a interface is a contract a capability that a class should provide
//interface we can build loose coupled calculator

}

public class User{

//defining the attribute

public String name;

//constructor creation

public User(String name, int age){

this.name=name;

}

//method creation

public void sayHello{

System.out.println("This is "+name);

}

//a interface is a contract a capability that a class should provide

//interface we can build loose coupled calculator

}

Interface Example

Leave a comment

Posted in Design Pattern, OO Analysis and Design, OOP, অবজেক্ট ওরিয়েন্টেড প্রোগ্রামিং

Programming Problem Solve with Python:

Posted on June 4, 2020 | Leave a comment

Problem: Only Positive Numbers

positiveFunc([-5,3,-1,101])

def positiveFunc(list_s):
  return [i for i in list_s if i>0]

1 2	def positiveFunc(list_s): return [i for i in list_s if i>0]

Leave a comment

Posted in Python

Solving for problem

Data Engineer Track

ArrayList in Java

Data Mining: Unit 9

Data Mining: Exercise 8

Java serious OOP Practice

Interface, Abstract Class and Polymorphism Example

My Java OOP example from Lessons

My Beautiful Crafted Java OOP

Empfindung = sensation, perception, feeling, emotion

German Word Learning

Unit 5- Multiple Linear Regression

Design Pattern and Object oriented Data Analaysis

Programming Problem Solve with Python:

Categories

Random Quote

Random Quotes

Recent Comments

Recent Posts

Archives

About Me & MyBlog

Caution and Tips:

My Facebook

Empfindung = sensation, perception, feeling, emotion

Categories

Random Quote

Random Quotes

Recent Comments

Tags

Recent Posts

Archives

About Me & MyBlog

Caution and Tips:

My Facebook