Duplicate values and PGLS: can I run with gls in NLME?

04 May 2021 1 5K Report

Hi, I am analyzing a regression evaluating litter size and a number of covariates for multiple taxa so I need to take phylogeny into account. I have multiple entries for some of the species (for instance latitude is quite variable for some species so I need multiple entries to take that variation into account). However, I realize that may create a problem with my analysis. I am able to run the data without a problem in nlme using the gls function but I'm not sure if that is ok with having multiple entries for the same species.

pglsModel

David Eugene Booth

You might want to consider this if your data contains repeated observations, I wasn't sure what you meant. A great source for that is Marie Davidian's course notes on longitudinal statistical models. Google it at Davidian NCSU statistics dept course notes longitudinal models. The notes are really good and contain R and SAS examples that you might be able to use. Best wishes, David Booth

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