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st: Re: dropped cases using mi impute mvn
From
exp12 <[email protected]>
To
[email protected]
Subject
st: Re: dropped cases using mi impute mvn
Date
Wed, 20 Oct 2010 18:21:58 -0700 (PDT)
I knew it had to be something simple, but didn't pick this up working through
the manual. Much thanks!
- Eric
On Wed, Oct 20, 2010 07:41 PM, "Wesley D. Eddings, StataCorp [via Statalist]"
<[email protected]> wrote:
>
>
>Eric <<>> asked about differences between the numbers of observations
>in imputations created by -mi impute mvn-:
>
>> The relevant lines of code are:
>>
>> mi set mlong
> (snip)
>
>> mi impute mvn y1 y2 y3 y4 y5 y6 dummy1 dummy2 = x1 x2, add(3)
>>
>> This runs without error, but as you can see below, the number of cases is
>> wrong for the three imputed data sets. Somehow 730 cases are dropped.
>>
>> . tab _mi_m
>>
>> _mi_m Freq. Percent Cum.
>>
>> 0 2,812 31.04 31.04
>> 1 2,082 22.99 54.03
>> 2 2,082 22.99 77.01
>> 3 2,082 22.99 100.00
>>
>> Total 9,058 100.00
>The -mi- commands are behaving as intended. The -mi- commands offer several
>storage styles, and Eric in his -mi set- command chose the -mlong- ("marginal
>long") style, which stores only the 2082 incomplete observations in the
>imputations. The 730 complete observations are not repeated in the imputations
>and are stored only in the original data.
>
>Eric mentioned -ice-, which always repeats the complete observations in the
>imputations. The official -mi- style that repeats the complete observations is
>-flong- ("full long"). All -mi- commands work regardless of style, but if Eric
>would prefer to work in the -flong- style, he may convert to it with the -mi
>convert- command.
>
>For more information on -mi- styles, Eric may type
>
> . help mi glossary
> . help mi styles
>
>-- Wes
><>
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Eric Plutzer, Professor of Political Science
and Academic Director, Survey Research Center
The Pennsylvania State University
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