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help for ^circnpde^
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Nonparametric density estimation for circular data
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    ^circnpde^ varname [^if^ exp] [^in^ range] [^, h(^#^)^
    ^genpdf(^pdfvar^) gendeg(^degvar^)^ graph_options ]

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

^circnpde^ produces nonparametric density estimates for circular
variables with scales between 0 and 360 degrees. The kernel is a quartic
or biweight kernel with a half-width given by ^h(^#^)^. The estimate is
produced for equally spaced angles on the circle.


Options
-------

^genpdf(^pdfvar^)^ specifies the name of a new variable in which
    probability density estimates are to be stored.

^gendeg(^degvar^)^ specifies the name of a new variable in which
    equally spaced angles are to be stored.

^h(^#^)^ specifies the half-width of the kernel in degrees. The default
    is 30.

graph_options are any of the options allowed with ^graph, twoway^;
    see help for ^graph^.


Examples
--------

        . ^circnpde wallasp^
        . ^circnpde wallasp, h(45) genpdf(wallpdf) gendeg(deg)^


Reference
---------

Fisher, N.I. 1993. Statistical analysis of circular data. Cambridge:
Cambridge University Press.


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


Also see
--------

On-line: help for @graph@, @circhist@, @circksm@, @circplot@