[R] Log likelihood question

[Phil]

I'm comparing a possion regression model (using glm) under R with same model
(using poisson) and same data in Stata.

Poisson GLM iteration using R has what it calls "deviance" values
Deviance = 1711.706 Iterations - 1 
Deviance = 1451.352 Iterations - 2 
Deviance = 1442.306 Iterations - 3 
Deviance = 1442.283 Iterations - 4 

Poisson GLM iteration using Stata gives log likelihood values
(0) -1567
(1) -1566
(2) -1566

As you can see, the R deviance values arent -2 * log likelihood values in
Stata. Any idea how R calculates its deviance values? 

Many thanks..

Phil



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