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help for ^robvar^                                            (STB-25: sg35)
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Robust tests for equality of variance
-------------------------------------

        ^robvar^ varname [^if^ exp] [^in^ range] ^, b^y^(^groupvar^)^


Description
-----------

^robvar^ calculates three robust tests of the hypothesis that the variance of a
variable is the same across groups.  The ^groupvar^ in the ^by()^ option defines
the groups.  ^robvar^ is a useful supplement to the classical hypothesis test
performed by Stata's ^sdtest^.


Option
------

^by(^groupvar^)^ specifies the variable that defines the groups across which the
    null hypothesis claims the variance is equal.


Author
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        Mario A. Cleves
        Arkansas Foundation for Medical Care
        Fax:  501-785-3460


Also see
--------

    STB:  STB-25  sg35
 Manual:  [5s] sdtest
On-line:  help for @sdtest@.