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Dear R users, I would like to fit a glm with Poisson distribution and log link with a known dispersion parameter. I do not want to estimate the dispersion parameter. I know what it is, so I simply want to...

I was not using a package to calculate QAIC. I will look into your suggestions, though. I thought it would be simple to ask glm to just fix the overdisperion at a particular value. Apparently it is not. Thank you...

Thank you so much for your reply, Z. Of course, you are correct about the overdispersion not affecting parameter estimation. But my goal is comparison of several models using QAIC and the dispersion parameter enters the QAIC calculation. I suppose...

Hello, all, I have a fairly complicated experimental design and would really appreciate some help on correctly specifying my random effects. I have a CRD split plot design with one covariate measured on the whole plot unit, one on the...

Using Ted Harding's example: news1o <- runif(1000000) s2o <- runif(1000000) pt1 <- proc.time() s <- numeric(length(news1o))-1 # Set all of s to -1 s[news1o>s2o] <-1 # Change to 1 only those values of s # for which news1o...

Chuck, Thank you for welcoming me to the list and thank you for taking the time to address my question. Pointing me to the pivot and qr components of my model object was very useful. But I still don't...

I would like to fit a glm with Poisson distribution and log link with a known dispersion parameter. I do not want to estimate the dispersion parameter. I know what it is, so I simply want to fix it at...