Message-ID: <4BF2883C.9030706@gmail.com>
Date: 2010-05-18T12:29:48Z
From: Manuel Spínola
Subject: Multiple proportions analysis in R
Dear list members,
The following question is not entirely an R question but I am looking
how to analyze the below data set in R (I know that sample size is very
low):
I have a data set corresponding to 12 nests with (20 to 30 eggs each).
The number of eggs per nest varies.
In each nest I assessed the stage of egg development, location (zone),
humidity and temperature.
nest stage0 stage2 stage3 stage4 zone humidity temp
1 12 8 0 0 a 4.35 34.5
2 0 10 2 14 a 5.56 32.4
3 0 14 0 12 a 6.57 33.7
4 0 12 15 3 b 7.08 33.4
.
.
12 0 6 20 0 c 5.07 34.5
I have multiple proportions (one for each stage) in each nest but they
are not independent.
I want to assess the effect of zone, humidity and temp on the proportion
of different stages at each nest.
Is this a case for a multinomial model?
How is a simple way to analyze this data set?
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