Re: st: Amelia object as data.frame

[Richard Williams <richardwilliams.ndu@gmail.com>]

At 10:08 AM 2/26/2013, Laura Maria Schwirz wrote:
> Thanks for your advice. Stata's mi does in fact not support msp and
> appears to allow mainly for various types of regression. Using another
> programme to impute data is just one option although as you very well
> point out I do need to bear in mind assumptions underlying mi and MSP.

I haven't been following this discussion but adding the -cmdok- 
option to -mi estimate- will often let you use multiple imputation 
with commands that don't have built-in support for it. Whether it 
will in this case (and whether the results can be trusted) I don't know.


> On 26 February 2013 14:09, daniel klein <klein.daniel.81@gmail.com> wrote:
> > Aside from the obvious -- R questions are not the topic to be
> > discussed on Statalist -- based on your earlier question
> > (http://www.stata.com/statalist/archive/2013-02/msg00960.html) I get
> > the impression you switch software, because Stata did not do what you
> > wanted.
> >
> > That is not necessarily a problem, but just some words of caution.
> >
> > Chaniging to another software, because Stata does not do what you
> > want, might not always be the best choice, given that there might be
> > good reason why Stat does not do what you want. Just because a(nother)
> > software does something, it does not mean that this something makes
> > any sense, or is statistically "correct".
> >
> > In your case the appearant reason -msp- (SSC) does not work with -mi-
> > is, that its author did not implement it to work with -mi-. Whether
> > there is a good statistical reason remains unclear to me. My point is,
> > that in any case you should think carefully about about what you want
> > to do. If you, for example,  want to combine Loevinger's H, think
> > about the distribution of this statistic. Is it normal? If not,
> > applying Rubin's combination rules (regardless of software) might not
> > be appropriate. This is discussed here:
> > 
> http://www.stata.com/support/faqs/statistics/combine-results-with-multiply-imputed-data/
> > along with how to get Stata to combine results from commands that do
> > not support -mi-.
> >
> > btw. Ameliaseems to  assume the data to follow a multivariat normal
> > distribution, which might not be appropriate with Items used for
> > Mokken scale analysis, and you need to think about this, too.
> >
> > Best
> > Daniel
> >
> > --
> > Hi Stata Users
> >
> > I have run multiple imputations using R's Amelia package and would
> > like to use the imputed dataset to analyse Mokken Scale Analysis.
> > But mokken requires the object to be a data frame. I tried
> > as.data.frame(x) and as.matrix(x) but it says that it cannot coerce
> > class amelia into a data frame or matrix.
> >
> > australia93=as.data.frame(australia93)
> > Error in as.data.frame.default(australia93) :
> >   cannot coerce class '"amelia"' into a data.frame
> >
> > coefH(australia93)
> > Error in check.data(X) : Data are not matrix or data.frame
> >
> > Any help would be much appreciated.
> > *
> > *   For searches and help try:
> > *   http://www.stata.com/help.cgi?search
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> > *   http://www.ats.ucla.edu/stat/stata/
> >
>
>
>
> --
> Laura Schwirz
>
> PhD Candidate and IRCHSS Scholar
> Department of Political Science
> Trinity College Dublin
> Dublin 2
> Republic of Ireland
> Email: schwirzl@tcd.ie
> *
> *   For searches and help try:
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> *   http://www.stata.com/support/faqs/resources/statalist-faq/
> *   http://www.ats.ucla.edu/stat/stata/

-------------------------------------------
Richard Williams, Notre Dame Dept of Sociology
OFFICE: (574)631-6668, (574)631-6463
HOME:   (574)289-5227
EMAIL:  Richard.A.Williams.5@ND.Edu
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*
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