[R] Error message using mi() in mi package

[Peter Ehlers]

On 2010-07-06 10:37, Andrew Miles wrote:
> Hello!
>
> I get the following message when I run the mi() function from the mi
> package.
>
> Error while imputing variable: c3 , model: mi.polr
> Error in eval(expr, envir, enclos) : could not find function "c14ordered"
>
> Here's the situation:
>
> I am running R v. 2.9.2 on Mac OSX v. 10.5.8. I am trying to impute
> missing data in a data set that I've trimmed down to 302 variables. I've
> created an mi.info() object on the data, and I've updated the "type" of
> variable where necessary so that the mi() imputing function uses the
> most appropriate type of models to estimate imputed values. The data
> have no collinearlity. I then run the mi function like this:
>
> imp = mi(imp.data, info=info2, n.iter=10)
>
> where imp.data is my data set of 302 variables and info2 is my modified
> mi.info object. I get the message as posted above. The message only
> occurs when working on a variable I have labeled as
> "ordered-categorical." But the mi() function processes most variables
> labeled as "ordered-categorical" just fine. In fact, if shrink my data
> set (say, to just 5 variables) I can get mi() to process a problematic
> variable just fine as well.
>
> I'm not sure what the function "c14ordered" is that the error message
> refers to. My first thought is maybe it is referring to one of my
> variables in my data? Variables names in my data follow a basic
> letter-number pattern (i.e. a1, a2, etc.), but there is no c14, rather
> c14a1, c14a2, etc. So I'm not sure if the variable has anything to do
> with the problem, but I thought I'd mention it just in case someone
> wiser in this matter than I can see something I cannot.
>
> I cannot post code that reproduces the problem due to the nature of the
> code and data involved.
>
> Any help would be appreciated, as I am not sure what is happening, and
> can't see why I can sometimes impute a variable labeled as
> "ordered-categorical" and sometimes cannot.
>
> Thanks!
>
> Andrew Miles
>

This looks suspiciously like a syntax problem.
I would get my text editor to search for 'c14ordered'
in the code. You might have missed some punctuation.

   -Peter Ehlers