Regression Analysis for Channel Routing
Regression Analysis for Channel Routing
(OP)
My regression analysis program that I developed in BASICS back in the 1980's applies for half a dozen equations. I would like to update my program to include this form: I(t)=P*(t^s)*(e^(-ft)) which I can transform it to this equivalent non- linear log form: Ln I(t)=Ln P + s*Ln t + (-ft); P,s and f are constants. Is there any way to take care of the term (-ft). I got 18 data points avaialble for this regression analysis.





RE: Regression Analysis for Channel Routing
isn't y= x^-n the same as
y= 1/x^n ?
RE: Regression Analysis for Channel Routing
I am trying to determine the values of constants of P,s and f of the Gama function I(t)=P*(t^s)*(e^(-ft)). t is for time; I(t)has values of cu.ft/sec or cu.m./sec. My computerized regression analysis is linear equations. Unfortunately the Gamma function turns out to be non-linear so beside trial and error how can I handle this non linear expression with regression analysis?
Here is another thought. Since I have 18 data points (flow vs time), can I solve theses constants with matrices using this transformation: Ln I(t)=Ln P + s*Ln t + (-ft) eventho I would have 18 rows and 4 columns?
RE: Regression Analysis for Channel Routing