st: New module -emh- on SSC

["Joseph Coveney" <jcoveney@bigplanet.com>]

Thanks to Kit Baum, a new module, -emh-, is available on SSC.  -emh- computes
extended Mantel-Haenszel chi-square statistics for stratified cross-tabulations.

Three types of test statistics are available.  The first type is suitable where
both row and column variables of the tables are at least ordinal (and may
actually be continuous), the second where the column (response) variable is at
least ordinal--and, again, may be continuous--but the row (predictor) variable
is categorical, and the third where both row and column variables are unordered
categorical.

These test statistics are mentioned by Bill Sribney at the end of the FAQ "Does
Stata provide a test for trend?". (See
www.stata.com/support/faqs/stat/trend.html .)

These are the same test statistics that SAS's PROC FREQ reports with the CMH
option.  SAS refers to these statistics collectively as Cochran-Mantel-Haenszel,
and to the three types of test as "Nonzero Correlation", "Row Mean Scores
Differ" (or "ANOVA"), and "General Association".

-emh- requires Stata version 11.1.

Bug reports and suggestions for improvements are welcome.

Joseph Coveney


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