Re: [R] GAM with the negative binomial distribution: why do predictions no match with original values?

. >> >> 32.03 61.18 97.20 112.20 165.00 226.00 >> >> >> >> Value range of observed data: >> >> >>> summary(nb_unique) >>> >>Min. 1st Qu. Median Mean 3rd Qu.Max. >> >> 43.00 67.00 81

Re: [R] GAM with the negative binomial distribution: why do predictions no match with original values?

ment and offset(). > Thanks a lot for your help. > Have a nice day > Marine > > > > > De : peter dalgaard > Envoy� : mardi 22 novembre 2016 23:52 > � : Bert Gunter > Cc : Marine Regis; r-help@r-project.org > Objet : Re: [R] GAM with the

Re: [R] GAM with the negative binomial distribution: why do predictions no match with original values?

e different between models with offset=argument and offset(). Thanks a lot for your help. Have a nice day Marine De : peter dalgaard Envoy� : mardi 22 novembre 2016 23:52 � : Bert Gunter Cc : Marine Regis; r-help@r-project.org Objet : Re: [R] GAM with the negative

Re: [R] GAM with the negative binomial distribution: why do predictions no match with original values?

> On 22 Nov 2016, at 23:07 , Bert Gunter wrote: > > Define "very different." Sounds like a subjective opinion to me, for > which I have no response. Apparently others are similarly flummoxed. > Of course they would not in general be identical. Er? I don't see much reason to disagree that a ran

Re: [R] GAM with the negative binomial distribution: why do predictions no match with original values?

Well part of the issue is that the negative binomial estimates are for means and they can differ a fair bit from the raw counts, but I'm also guessing that part of the issue is that the offset may not be accounted for with the predict.gam() function. Brian Brian S. Cade, PhD U. S. Geological Sur

Re: [R] GAM with the negative binomial distribution: why do predictions no match with original values?

> On Nov 22, 2016, at 1:29 PM, Marine Regis wrote: > > Hello, > >> From capture data, I would like to assess the effect of longitudinal changes >> in proportion of forests on abundance of skunks. To test this, I built this >> GAM where the dependent variable is the number of unique skunks and

Re: [R] GAM with the negative binomial distribution: why do predictions no match with original values?

Define "very different." Sounds like a subjective opinion to me, for which I have no response. Apparently others are similarly flummoxed. Of course they would not in general be identical. Cheers, Bert Bert Gunter "The trouble with having an open mind is that people keep coming along and sticki

[R] GAM with the negative binomial distribution: why do predictions no match with original values?

Hello, >From capture data, I would like to assess the effect of longitudinal changes >in proportion of forests on abundance of skunks. To test this, I built this >GAM where the dependent variable is the number of unique skunks and the >independent variables are the X coordinates of the centroid