[R-sig-eco] From: Angie Larsen

2014-10-24 Thread Angie Larsen
Hey http://d2vadds.com/father.php?born=3zcmkn5madsq1fudm2 Angie Larsen [[alternative HTML version deleted]] ___ R-sig-ecology mailing list R-sig-ecology@r-project.org https://stat.ethz.ch/mailman/listinfo/r-sig-ecology

Re: [R-sig-eco] Logistic regression with 2 categorical predictors

2014-10-24 Thread Gavin Simpson
Hi Andrew, On 24 October 2014 01:41, Andrew Halford wrote: > Dear Gavin, > > Firstly let me say that I take offence at your "bogus" comment. Just > because I, like many others who interact on this list, often struggle > conceptually with the overwhelming analysis choices that are required in > o

[R-sig-eco] Logistic regression with 2 categorical predictors

2014-10-24 Thread Dixon, Philip M [STAT]
Andrew, Your problems arise from two issues: 1) The overall test of equal P[prefer] in each age and the tests of equal P[prefer] in a specific pair of ages are based on different testing philosophies (Score or LR test for the overall test and Wald test for the pairwise comparisons). 2) The be

Re: [R-sig-eco] Logistic regression with 2 categorical predictors

2014-10-24 Thread Jari Oksanen
Andrew, If the 24 rows are the data you are analysing, I cannot replicate any of your significant results within that glm framework *if* I take into account the overdispersion. The full model with age*test interaction is saturated and cannot be analysed at all, but the main effects model age+te

Re: [R-sig-eco] Logistic regression with 2 categorical predictors

2014-10-24 Thread Andrew Halford
Dear Gavin, Firstly let me say that I take offence at your "bogus" comment. Just because I, like many others who interact on this list, often struggle conceptually with the overwhelming analysis choices that are required in our line of work doesn't give you the right to drop snide remarks as you s

Re: [R-sig-eco] Regression with few observations per factor level

2014-10-24 Thread Jari Oksanen
On 24/10/2014, at 09:03 AM, V. Coudrain wrote: > Thank you all for the good discussion. To recenter the debate if you are > interested in, my data are actually: 20 sample locations distributed across 5 > treatments (4 locations / treatment). Each sample location has been surveyed > for 4 years