Dear list,

I have recently encountered an odd error when running glm(dep~indep, quasipoisson): while, with a subset of my data, I could get a perfectly reasonable model, once I include all of my data (17K+ observations, 29 variables), I get the following error:

Error in if (any(y < 0)) stop("negative values not allowed for the quasiPoisson family") :
  missing value where TRUE/FALSE needed
In addition: Warning message:
In Ops.factor(y, 0) : < not meaningful for factors

I say this is odd because I triple checked my response variable, and not a single observation is negative. Is R encountering an error due to the size of the data, and somehow returning a 'random' error? (would be stranger still!)

Thanks a million, hope this makes sense.

Cheers,


Wil

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