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help for ^collfreq^                                   (STB-44: dm59)
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Collapse to frequencies
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    ^collfreq^ varlist [weight] [^if^ exp] [^in^ range]
            [, ^f^req^(^string^) z^ero ^nomiss^ ]

^fweight^s are allowed.


Description
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Given varlist, ^collfreq^ produces a new data set consisting of all
combinations of varlist that exist in the data together with a new
variable that contains the frequency of each combination.

^collfreq^ destroys the data in memory.


Options
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^freq(^string^)^ specifies a name for the frequency variable. If not
    specified, ^freq^ and ^_freq^ are tried in turn. The name must be new.

^zero^ specifies that combinations with frequency zero are wanted.

^nomiss^ specifies that observations with missing values on any of the
    variables in varlist will be dropped.  If not specified, all
    observations possible are used.


Examples
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    . ^collfreq foreign rep78^

    . ^collfreq foreign rep78, z^

Author
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       Nicholas J. Cox
       University of Durham, UK
       n.j.cox@@durham.ac.uk


Also see
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       STB:  STB-44 dm59