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5 results for “from:Heather Kharouba”

Quasi-binomial GLM and model selection
Heather Kharouba · Feb 5, 2010 · r-help

Hi, I'm using a GLM with a quasi binomial error distribution and I would like to do a model selection method similar to step(AIC) to carry out a restricted search for the "best" model. I would like to...

Counting number of points per pixel in a grid
Heather Kharouba · Oct 20, 2009 · r-sig-geo

Hi, I would like to count the number of points per pixel in a grid(there are thousands of points and thousands of pixels). I have a list of occurrence points and a grid with a given cell size. Ideally...

Dealing with overdispersion with glmmadmb beta distribution
Heather Kharouba · Jul 8, 2012 · r-sig-mixed-models

Dear R users, In the analysis I'm doing, I'm interested in testing the importance of a factor (with 5 levels). The response variable varies continuously from 0 to 1 so I've used a beta distribution with glmmadmb...

Error with glmmADMB and beta distribution
Heather Kharouba · Jun 12, 2012 · r-sig-mixed-models

Hello, I am new to glmmADMB and would like to use the beta distribution with glmmadmb. However, I keep running into the same error. The response variable is AUC (area under the curve data) from species distribution models which is...

Error with glmmADMB and beta distribution
Heather Kharouba · Jun 13, 2012 · r-sig-mixed-models

You're right, I have 116 AUC values of 1 (out of 4318 observations). I tried running the model without these values and I still got the same error. When I also excluded the random effect (in addition to removing...

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