coefficient polynomial regression

In my mega project I want to find out coefficient of polynomial equation .The eq is

f(x)=(ax+b)summation of(ci(x*mod(lamda))^i where i from 0 to degree of equation.

In this equation x is difference between days for ex. 10days,20days ie. after purchasing of one product user purchase another product after 10 days or 20 days.& y means how much time this sequence of 10 days or 20 days comes in database ex. user purchase a product series(after purchasing a they purchase b so ab is one series) of 10 days for 5 times so y=5.
so for that polynomial equation has been used. lamda is the error in that sequence & I know value of x,y,lamda,i,a,b. & ci is coefficient of polynomial equation.I have large database for x & y & I want to find eq f(x).So anyone can help me how to find constant ci (i=0 to i=degree of eq).

1 Reply

Know the answer? Post it — somebody with the same question will find it here.

Mahesh Chand15y ago
I am still confused about the question. Are you asking us to provide you mathematical solution for this?

I think you need to figure out the solution in mathematical terms. We, here can help you convert it to C# (programming language). I know I learned this in when I was doing my Major in Math but I have no idea now. Also, I do not intended to open my math books again!
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