For my project I have to fit a gamma distribution through my data points. This fit works well, but I want to extract data points from this fit with error bars. For these error bars I use partial derivatives w.r.t. to each parameter of my gamma distribution. Well here arises the problem…
The derivative of the gamma distribution yields a digamma function, which I can’t find in the ROOT documentation. Is there another way to implement this function into ROOT?
Remco de Smit