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2010 Jan 18
2
column selection for aggregate()
...f questions (you may have
noticed that it's the 3rd email today). I'm new on R, so please excuse
the "spam"!
I have a dataset "ssfa" with many rows and the column names are:
> names(ssfa)
[1] "SPECSHOR" "BONE" "TO_POS" "MEASUREM" "FACETTE" "SHEARFAC"
[7] "ENA_BA" "SEL_FACET" "SEL_MEAS" "Asfc" "Smc" "epLsar"
[13] "HAsfc4" "HAsfc9" "HAsfc16" "HAsfc25" "HAsfc36"...
2009 Sep 02
1
Ability Estimates for Repeated Measurements in the eRm Package
Dear R Users,
I am using the LLTM and the LRSM functions in the eRm package to do repeated
measurements where there are 2 measurement points for a list of 10 items. I
am trying to get ability estimates but am having trouble. I don't think
that it is appropriate to use the pmat function since the person parameters
are based on all 20 items. Rather, I think it would be more appropriate to
ha...