Quantile-quantile plot for circular data
circqqplot varname1 varname2 [if exp] [in range] , centre(#1 [#2]) [yshow(numlist) xshow(numlist) plot(plot) qqplot_options]
circqqplot gives a quantile-quantile plot for two circular variables on a scale between 0 and 360 degrees. Note that the variables are not paired and do not even have to be non-missing for the same observations. Both variables are rotated so that each set of values is centred on a specified value. Each is nevertheless labelled in terms of the original variables.
centre() is a required option. With one argument, it specifies a centre to be used for both variables. With two arguments, it specifies two centres to be used for the first and second variable respectively. The spelling center() is indulged.
yshow() specifies a numlist of y axis labels to be shown, overriding the default.
xshow() specifies a numlist of x axis labels to be shown, overriding the default.
plot(plot) provides a way to add other plots to the generated graph; see help plot_option.
qqplot_options are any options allowed with qqplot.
. circqqplot axisasp wallasp, centre(45)
Nicholas J. Cox, University of Durham, U.K. email@example.com
On-line: help for circqvm, diagplots