Equivalence tests of proportions                                 (STB-17: sg21)
--------------------------------

        ^equip^ varname ^=^ # [^if^ exp] [^in^ exp] [, ^d^elta(str) ^sd^elta(str)
                                           ^r^andom]

        ^equip^ varname ^=^ varname [^if^ exp] [^in^ exp] [, ^d^elta(str) ^sd^elta(str)
                                           ^r^andom]

        ^equip^ varname [^if^ exp] [^in^ exp] [, ^d^elta(str) ^sd^elta(str)
                                           ^r^andom ^b^y(varname)]

        ^equipi^ p1 n1 pbase [, ^d^elta(str) ^sd^elta(str)]

        ^equipi^ p1 n1 sd1 p2 n2 sd2 [, ^delta(str) ^sd^elta(str)]


tests the null hypothesis that the proportion of observations with a value
of `1' differs by at least ^delta^ (or, by ^delta^ in the negative direction 
and ^sdelta^ in the positive direction).  In the third form, ^equip^ tests 
that the proportion of observations with a value of `1' is equivalent within 
the two groups specified in ^by^(varname).

^equipi^ is the immediate version of ^equip^.  In the second form of the command,
p1, n1, and sd1 should be the values for the control, baseline, or 
reference group.




Options
-------
^delta^ and ^sdelta^ control the width of the equivalence interval.  If 
    neither option is specified, a default of .2*mean1 is used for both
    ^delta^ and ^sdelta^.  In the first form of the command, however, ^delta^ 
    is 20 percent of this number.  ^delta^ can be entered either as a real 
    number or as a percent.  If you enter it as a percent, then you ^must^ 
    include the "%" symbol.

^random^ indicates that ^delta^ is to be treated as an estimated amount.  As 
    a consequence, the variance is increased (i.e., the confidence intervals
    are widened).  If ^random^ is not specified, ^delta^ is treated as fixed 
    and known.



Author
------
        Richard Goldstein
        EMAIL goldst@@harvarda.bitnet
        

Also see
--------

    STB:  sg21 (STB-17)
On-line:  ^help^ for ^equim^ and ^equip^