[R] Help with using unpenalised te smooth in negative binomial mgcv gam

Hi, I have been trying to fit an un-penalised gam in mgcv (in order to get more reliable p-values for hypothesis testing), but I am struggling to get the model to fit sucessfully when I add in a te() interaction. The model I am trying to fit is: gam(count~ s(x1, bs = "ts", k = 4, fx = TR

[R] Can you use two offsets in gam (mgcv)?

Hello, I have been trying to find out whether it is possible to use more than one offset in a gam (in mgcv). The reason I would like to do this is to 1) account for area surveyed in a Poisson model of sightings of porpoises within defined grid cells (each cell has a slightly different area) and

Re: [R] Gls function in rms package

Hello, I was wondering whether there had been any progress on this bug yet? I have checked for updates to the package and it doesn't seem that there have been any, but I might be mistaken! Similarly to Mark, I am getting the following error message when running a Gls with two (factor) covariates (