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help for ^circysm^
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Smoothing including lowess for circular data, y-variable circular
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    ^circysm^ yvar xvar [^if^ exp] [^in^ range]
    [ ^, g^enerate^(^newvar^)^ ksm_options circplot_options ]

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

^circysm^ carries out smoothing (including lowess) of a circular
y-variable (specified first in the varlist) with respect to some
non-circular x variable. yvar should take on values between 0 and 360
degrees. The smoothed result is

    arctan(smoothed sine of yvar / smoothed cosine of yvar)

and the kind and degree of smoothing are specified by invoking options
of ^ksm^. ^circplot^ is used to show the results graphically, and must
be installed.


Options
-------

^generate(^newvar^)^ specifies that newvar is to be generated containing
     the results of smoothing.

ksm_options are the options ^line^, ^weight^, ^bwidth()^ and ^lowess^
    allowed with ^ksm^; see help for ^ksm^.

circplot_options are those allowed with ^circplot^; see help for
    ^circplot^.


Examples
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        . ^circysm wallasp length, gen(lowessl) lowess^


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


Also see
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On-line: help for @ksm@, @graph@, @circplot@, @circxsm@