3 messages · Manuel Spínola, ONKELINX, Thierry, Maarten de Groot
Dear list members, Is there any function to do zero-truncated poisson or zero-truncated negative binomail in R? Thank you very much in advance. Best, Manuel Sp?nola
Manuel Sp?nola, Ph.D. Instituto Internacional en Conservaci?n y Manejo de Vida Silvestre Universidad Nacional Apartado 1350-3000 Heredia COSTA RICA mspinola at una.ac.cr mspinola10 at gmail.com Tel?fono: (506) 2277-3598 Fax: (506) 2237-7036
Have a look at hurdle() from the pscl package. HTH, Thierry ---------------------------------------------------------------------------- ir. Thierry Onkelinx Instituut voor natuur- en bosonderzoek team Biometrie & Kwaliteitszorg Gaverstraat 4 9500 Geraardsbergen Belgium Research Institute for Nature and Forest team Biometrics & Quality Assurance Gaverstraat 4 9500 Geraardsbergen Belgium tel. + 32 54/436 185 Thierry.Onkelinx at inbo.be www.inbo.be To call in the statistician after the experiment is done may be no more than asking him to perform a post-mortem examination: he may be able to say what the experiment died of. ~ Sir Ronald Aylmer Fisher The plural of anecdote is not data. ~ Roger Brinner The combination of some data and an aching desire for an answer does not ensure that a reasonable answer can be extracted from a given body of data. ~ John Tukey
-----Oorspronkelijk bericht----- Van: r-sig-ecology-bounces at r-project.org [mailto:r-sig-ecology-bounces at r-project.org] Namens Manuel Sp?nola Verzonden: maandag 17 mei 2010 4:15 Aan: r-sig-ecology at r-project.org Onderwerp: [R-sig-eco] Zero-truncated Poisson model in R Dear list members, Is there any function to do zero-truncated poisson or zero-truncated negative binomail in R? Thank you very much in advance. Best, Manuel Sp?nola -- Manuel Sp?nola, Ph.D. Instituto Internacional en Conservaci?n y Manejo de Vida Silvestre Universidad Nacional Apartado 1350-3000 Heredia COSTA RICA mspinola at una.ac.cr mspinola10 at gmail.com Tel?fono: (506) 2277-3598 Fax: (506) 2237-7036
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Hi Manuel, It seems that the package VGAM is taking zerotruncated models into account. You can find more info on http://www.stat.auckland.ac.nz/~yee/VGAM/index.html. You can use as a family function "posnegbinomial" (for zero truncated data with negative binomial distribution) or "pospoisson" (for zero truncated data with poisson distribution). kind regards, Maarten
Dear list members, Is there any function to do zero-truncated poisson or zero-truncated negative binomail in R? Thank you very much in advance. Best, Manuel Sp?nola