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help for circxlowess
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Smoothing including lowess for circular data, x variable circular 

        circxlowess yvar xvar [if exp] [in range] [ , pad(#) lowess_options ]


Description 

    circxlowess carries out smoothing (including lowess) of a y variable yvar
    (specified first in the varlist) with respect to some circular x variable
    xvar. xvar should take on values between 0 and 360 degrees. Smoothing is
    done by temporarily adding pads of repeated values at either end of the
    circular scale.

    The kind and degree of smoothing and the rendition of the display are
    specified by invoking options of lowess.


Options

    pad(#) specifies a pad of # degrees at each x axis end. Data less than or
        equal to # degrees are copied at the right end of the x axis for an
        interval of 360 to 360 + # degrees.  Data more than 360 - # degrees
        are copied at the left end of the x axis for an interval of -# to 0
        degrees. The default is 180, so that a full two cycles are shown.

    lowess_options specify options allowed with lowess.


Examples 

    . circxlowess length wallasp, gen(lowess) 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, circylowess