Display the result of a quadrat counting test.
Given the result of a quadrat counting test, graphically display the quadrats that were used, the observed and expected counts, and the residual in each quadrat.
## S3 method for class 'quadrattest': plot(x, ..., textargs=list())
This is the plot method for objects
"quadrattest". Such an object is produced by
quadrat.test and represents the result of
a $\chi^2$ test for a spatial point pattern.
The quadrats are first plotted using
Then in each quadrat, the observed and expected counts
and the Pearson residual are displayed as text using
Observed count is displayed at top left; expected count at top right;
and Pearson residual at bottom.