Date:         Fri, 15 Jul 2011 11:33:50 -0400
Reply-To:     Gene Maguin <emaguin@buffalo.edu>
Sender:       "SPSSX(r) Discussion" <SPSSX-L@LISTSERV.UGA.EDU>
From:         Gene Maguin <emaguin@buffalo.edu>
Subject:      Treatment of missing data in Mixed
Content-Type: text/plain; charset="UTF-8"

All,

Sorry, hit the wrong key!

Somebody told me that Mixed uses the EM algorithm to include cases with missing data. My understanding, based on the documentation for the missing subcommand, is that EM was not used.

􀂄 Cases, which contain system-missing values in one of the variables, are always deleted.
􀂄 The keywords EXCLUDE and INCLUDE are mutually exclusive. Only one of them can be
specified at once.
EXCLUDE Exclude both user-missing and system-missing values. This is the default.
INCLUDE User-missing values are treated as valid. System-missing values cannot be included
in the analysis.

Furthermore, I don't find any mention of 'EM' or 'expectation-maximization' in the Mixed section of the Algorithms documentation.

I conclude that Mixed does not use EM to include cases with missing data. Is my understanding correct?

Thanks, Gene Maguin

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