st: New packages for spatial data analysis

[Maurizio Pisati <maurizio.pisati@unimib.it>]

Thanks to Kit Baum, two new Stata packages called -spgrid- and -spkde- 
are now available from the SSC Archive.
(1) -spgrid- generates two-dimensional grids that can be used by other 
Stata programs to carry out several kinds of spatial data analysis.
(2) -spkde- implements a variety of kernel estimators of both the 
probability density function and the intensity function of 
two-dimensional spatial point patterns. Moreover, with a little bit of 
extra typing, it can also be used to estimate the bivariate probability 
density function of any pair of quantitative variables (example in the 
help file). To work properly, -spkde- requires datasets generated by 
-spgrid-. To visualize kernel estimates, the user-written Stata program 
-spmap- is required.
Best wishes,
Maurizio

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