Displaying 3 results from an estimated 3 matches for "jtw2".
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btw2
2005 Nov 16
6
nlme question
I am using the package nlme to fit a simple random effects (variance
components model)
with 3 parameters: overall mean (fixed effect), between subject
variance (random) and
within subject variance (random).
I have 16 subjects with 1-4 obs per subject.
I need a 3x3 variance-covariance matrix that includes all 3 parameters
in order to
compute the variance of a specific linear
2005 Nov 16
0
nmle question
Hello.
I have 16 subjects with 1-4 obs per subject.
I am using the package "nlme" to fit a simple random effects (variance
components model) with 3 parameters: overall mean (fixed effect),
between subject variance (random) and within subject variance (random).
I need a 3x3 variance-covariance matrix that includes all 3 parameters
in order to compute the variance of a specific
2006 Mar 08
1
power and sample size for a GLM with Poisson response variable
Craig, Thanks for your follow-up note on using the asypow package. My
problem was not only constructing the "constraints" vector but, for my
particular situation (Poisson regression, two groups, sample sizes of
(1081,3180), I get very different results using asypow package compared
to my other (home grown) approaches.
library(asypow)
pois.mean<-c(0.0065,0.0003)
info.pois <-