st: Poisson residuals

[Fabien Bertho <fabien.bertho@sciences-po.org>]

Hello,

I am trying to compute residuals after Poisson regressions.

First, I used the following code:

predict yhat
gen poisson_residual= y - yhat

Then, I tried the Stata command

predict poisson_residual_stdp, stdp

Finally, I tried this one

predict poisson_residual_score, score


The first code gives exactly the same values as the third one. And I don't understand the difference with the second computation. 

Please, what is the difference between both and and which is the right value?

Thank you.

Fabien BERTHO

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