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help for circylowess
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Smoothing including lowess for circular data, y variable circular 

        circylowess yvar xvar [if exp] [in range] [ , generate(newvar)
                 lowess(lowess_options) scatter(scatter_options) plot(plot) ]


Description 

    circylowess carries out smoothing (including lowess) of a circular y
    variable yvar (specified first in the varlist) with respect to some
    non-circular x variable xvar. 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
    lowess. circscatter is used to show the results graphically.


Options 

    generate() specifies a new variable to be generated containing the
        results of smoothing.

    lowess() specifies options allowed with lowess. The following are
        relevant: mean, noweight, bwidth(), logit and adjust.

    scatter() specifies options allowed with circscatter.

    plot(plot) provides a way to add other plots to the generated graph; see
        help plot_option.


Examples 

    . circylowess wallasp length, gen(lowess) scatter(yla(,ang(h)))


Author 

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


Also see 

    On-line: help for lowess, circscatter, circxlowess