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help for circkdensity
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Nonparametric density estimation for circular data

        circkdensity varname [if exp] [in range] [ , h(#) genpdf(newvar1)
                 gendeg(newvar2) line_options ]


Description 

    circkdensity produces and graphs 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().  See Fisher
    (1993) for more details and discussion. The estimate is produced for
    min(_N, 360) equally spaced angles on the circle.  Note that circkdensity
    is not implemented using kdensity.


Options 

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

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

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

    line_options are any of the options allowed with line.


Examples

    . circkdensity wallasp

    . circkdensity wallasp, h(45) genpdf(wallpdf) gendeg(deg)


Author 

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


References 

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


Also see 

    On-line: help for circhistogram