[R-sig-ME] repeated measures: levels of grouping factor must be less than number of obs
bpederse at gmail.com
Mon Apr 18 17:33:13 CEST 2011
hi, I posted this to the main R mailing list a while back and people
directed me to
the lme4 package and this mailing list so I thought I might get more
We have some data, a subset of which is pasted at the end of this message.
I am trying to understand how to do repeated measures as our study
design consists of a subject (proband) and 1 or 2 siblings.
Thus far, our model looks like this--with family_id indicating a
> model = lmer(y ~ concordant + age.proband + age.other + sex.proband + sex.proband + sex.other + (1| family_id), data=df2)
is the above formulation sufficient to capture the repeated measures by family?
Next, when I do this with lme4a, I get an error:
Error in lmer(y ~ concordant + age.proband + age.other + sex.proband + :
number of levels of each grouping factor must be less than number of obs
I have seen this thread:
but the change does not appear to be included in the latest lme4a
package from Rforge, is there another repo where this has been
incorporated? or is this an error on my part?
concordant family_id external_ref.proband external_ref.other
sex.proband sex.other age.proband age.other y(fake)
T 58 80015550 80015543 M F 15 19 1
F 58 80015550 80016946 M F 15 8 2
T 54 80015499 80015338 F F 5 7 3
F 54 80015499 80013112 F M 5 13 4
F 22 80012269 80012252 F F 12 10 5
F 22 80012269 80018691 F M 12 8 5
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