I'm not sure what you're asking either.
This is linear regression and it seems that you want to find the estimates of those constants.
Can any one please tell me?
“How to calculate coefficient of independent variable in non linear regression?”
For example I want to calculate value of y
Y=a + b*x1 + c*x2 + d*x3
Y= Dependant variable
a, b, c, d = constant
x1, x2, x3= independent variable.
In this case how to calculate value of a, b, c and d. If you have any idea please tell me how to calculate it