MH MACRO

The mh.sps macro is most easily used by simply having it resident as a text
file in your working directory and executing the following SPSS syntax:

INCLUDE MH.SPS .
MH rowvar colvar stratvar .

where rowvar is the name of one of the two primary variables, colvar is the
other primary variable and stratvar is the stratification variable. As usual,
a working data file must be defined when invoking the macro. The data may be
either individual cases or weighted aggregated data, just as with most SPSS
procedures. 

The macro first saves your working data file to a file named mh__tmp1.sav.
The double underscore in the file name is an attempt to render unlikely the
overwriting of an existing file. The same convention has been used later in
the macro when creating new variables in an attempt to avoid duplicating
existing variable names. Such duplication would cause the macro to fail. The
SET commands are used to minimize output; they may be changed or removed if
you have problems running the macro in order to aid in identification of
problem sources.

The macro should function on any SPSS release offering macro support. It
uses commands and procedures from the Base System exclusively, so it does
not require the Advanced Statistics module, as do the official SPSS macros
released with Windows versions of SPSS. It consists essentially of some
data manipulation, some basic calculations and a reporting of results. The
row and column variables can be either numeric or string variables (as they
are handled using AUTORECODE). Each variable should assume only two unique
values in the data (since they define a 2x2 cross classification). More
than two distinct values on either or both of these variables will cause the
macro to fail. The stratification variable can also be either string or
numeric; each unique value defines a stratum.

Multiple invocations of the macro within the same session of SPSS for
Windows will produce warnings; these can be ignored.