Regression Method in C

In statistics, regression analysis is a statistical process for estimating the relationships among variables. It includes many techniques for modelling and analyzing several variables, when the focus is on the relationship between a dependent variable and one or more independent variables.

Program of Regression in C

   #include<conio.h>
   #include<math.h>
   #include<stdio.h>
   void main()
   {
    float x[50],y[50],y1,a,b,flag1=0,flag2=0,meanx,meany,sum=0,sum1=0;
    int i,n;
    clrscr();
    printf("Enter the values of n :- ");
    scanf("%d",&n);
    printf("Enter the values of x :- \n");
    for(i=1;i<=n;i++)
    {
        scanf("%f",&x[i]);
        flag1=flag1+x[i];
    }
    printf("Enter the values of y :- \n");
    for(i=1;i<=n;i++)
    {
        scanf("%f",&y[i]);
        flag2=flag2+y[i];
    }
    meanx=flag1/n;
    meany=flag2/n;
    for(i=1;i<=n;i++)
    {
        sum=sum+(x[i]-meanx)*(y[i]-meany);
        sum1=sum1+(x[i]-meanx)*(x[i]-meanx);
    }
    a=sum/sum1;
    b=meany-a*meanx;
    printf("/nRegression Equation Y = (%f)X + %f",a,b);
    getch();
    }

Output