Alain- Thanks again for the response. I guess my question is more related to R, which I'm learning as I go along. Could you provide guidance as to how I would code this in R?
Thanks, Laura From: Alain Zuur [via R] [mailto:ml-node+s789695n4635920...@n4.nabble.com] Sent: Monday, July 09, 2012 5:20 PM To: Lee, Laura Subject: Re: Predicted values for zero-inflated Poisson Laura Lee laura.lee at ncdenr.gov Mon Jul 9 22:51:40 CEST 2012 Previous message: [R] Predicted values for zero-inflated Poisson Next message: [R] Lavaan Package - How to Extract Residuals in Data Values Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] Thanks for your reply. I do have a copy of "Zero Inflated Models and Generalized Linear Mixed Models with R" and have been using that as a guide. I applied the predict function (type="count") to the dataset for which I built the model to compare the predicted bycatch numbers to the observed to ensure I was doing things correctly. When I summed over the new predicted variable, the value is over 500 whereas there were less than 10 observed. I'd appreciate any advice regarding what I'm doing wrong. -- View this message in context: http://r.789695.n4.nabble.com/Predicted-values-for-zero-inflated-Poisson-tp4635861p4635916.html Sent from the R help mailing list archive at Nabble.com. AFZ: Laura....no...you don't want to compare the count part of the model with raw data....you need to compare the Exp(Y) = (1-pi) * mu with the raw data. Have a look at the Epilogue chapter....it shows the difference between mu and (1-pi) * mu. Alain -- Dr. Alain F. Zuur First author of: 1. Analysing Ecological Data (2007). Zuur, AF, Ieno, EN and Smith, GM. Springer. 680 p. URL: www.springer.com/0-387-45967-7<http://www.springer.com/0-387-45967-7> 2. Mixed effects models and extensions in ecology with R. (2009). Zuur, AF, Ieno, EN, Walker, N, Saveliev, AA, and Smith, GM. Springer. http://www.springer.com/life+sci/ecology/book/978-0-387-87457-9 3. A Beginner's Guide to R (2009). Zuur, AF, Ieno, EN, Meesters, EHWG. Springer http://www.springer.com/statistics/computational/book/978-0-387-93836-3 4. Zero Inflated Models and Generalized Linear Mixed Models with R. (2012) Zuur, Saveliev, Ieno. http://www.highstat.com/book4.htm Other books: http://www.highstat.com/books.htm Statistical consultancy, courses, data analysis and software Highland Statistics Ltd. 6 Laverock road UK - AB41 6FN Newburgh Tel: 0044 1358 788177 Email: [hidden email]</user/SendEmail.jtp?type=node&node=4635920&i=0> URL: www.highstat.com<http://www.highstat.com> URL: www.brodgar.com<http://www.brodgar.com> [[alternative HTML version deleted]] ______________________________________________ [hidden email]</user/SendEmail.jtp?type=node&node=4635920&i=1> mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. Dr. Alain F. Zuur First author of: 1. Analysing Ecological Data (2007). Zuur, AF, Ieno, EN and Smith, GM. Springer. 680 p. URL: www.springer.com/0-387-45967-7<http://www.springer.com/0-387-45967-7> 2. Mixed effects models and extensions in ecology with R. (2009). Zuur, AF, Ieno, EN, Walker, N, Saveliev, AA, and Smith, GM. Springer. http://www.springer.com/life+sci/ecology/book/978-0-387-87457-9 3. A Beginner's Guide to R (2009). Zuur, AF, Ieno, EN, Meesters, EHWG. Springer http://www.springer.com/statistics/computational/book/978-0-387-93836-3 Other books: http://www.highstat.com/books.htm Statistical consultancy, courses, data analysis and software Highland Statistics Ltd. 6 Laverock road UK - AB41 6FN Newburgh Tel: 0044 1358 788177 Email: highs...@highstat.com<mailto:highs...@highstat.com> URL: www.highstat.com<http://www.highstat.com> URL: www.brodgar.com<http://www.brodgar.com> ________________________________ If you reply to this email, your message will be added to the discussion below: http://r.789695.n4.nabble.com/Predicted-values-for-zero-inflated-Poisson-tp4635861p4635920.html To unsubscribe from Predicted values for zero-inflated Poisson, click here<http://r.789695.n4.nabble.com/template/NamlServlet.jtp?macro=unsubscribe_by_code&node=4635861&code=bGF1cmEubGVlQG5jZGVuci5nb3Z8NDYzNTg2MXw0NTg5ODY5NTk=>. NAML<http://r.789695.n4.nabble.com/template/NamlServlet.jtp?macro=macro_viewer&id=instant_html%21nabble%3Aemail.naml&base=nabble.naml.namespaces.BasicNamespace-nabble.view.web.template.NabbleNamespace-nabble.view.web.template.NodeNamespace&breadcrumbs=notify_subscribers%21nabble%3Aemail.naml-instant_emails%21nabble%3Aemail.naml-send_instant_email%21nabble%3Aemail.naml> ----- Laura M. Lee Senior Stock Assessment Scientist North Carolina Division of Marine Fisheries E-Mail: laura....@ncdenr.gov -- View this message in context: http://r.789695.n4.nabble.com/Predicted-values-for-zero-inflated-Poisson-tp4635861p4635978.html Sent from the R help mailing list archive at Nabble.com. [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
