Hi Matt---
I uncovered a couple small glitches in AMELIA…
(1) If I identify a nominal variable with exactly 10
unique values, AMELIA gives the following message:
"Warning in amcheck(x = x, m = m, idvars =
numopts$idvars, priors = priors, :
The number of catagories in one of the variables
marked nominal has greater than 10 categories. Check nominal specification"
I suspect that AMELIA is counting "NA" as one of
the unique values.
This can be corrected by rewriting the statement that counts
the number of unique values, as follows:
categories <- length( unique(IVs)
[ !is.na (unique (IVs) ) ] )
I'm not sure whether AMELIA only checks the number of unique
values for the variables passed in the "bounds" input file, or if it also
checks the number of unique values passed in the "noms" and
"ords" input files… If it checks all of these, then there may be
more than one statement that needs to be modified.
(2) Also, the error message cited above has a misspelled word
("catagories")…
Wayne A. Thornton
Harvard University
