help spmat                                                   also see:  spreg  
                                                                        spivreg
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Title

spmat -- Create and manage spatial-weighting matrix objects (spmat objects)

Syntax

spmat subcommand ... [, ...]

subcommand Description ------------------------------------------------------------------------- contiguity create an spmat object containing a contiguity matrix W idistance create an spmat object containing an inverse-distance matrix W

summarize summarize an spmat object note manipulate a note attached to an spmat object graph draw an intensity plot of W lag create a spatially lagged variable eigenvalues add eigenvalues of W to an spmat object drop drop an spmat object from memory

save save an spmat object to disk in Stata's native format export save an spmat object to disk as a text file getmatrix copy a matrix from an spmat object to a Mata matrix use create an spmat object from a file created by spmat save import create an spmat object from a text file dta create an spmat object from a Stata dataset putmatrix put a Mata matrix into an spmat object

permute permute rows and columns of W tobanded transform an n x n W into a banded b x n W -------------------------------------------------------------------------

Description

Spatial-weighting matrices are used to model interactions between spatial units in a dataset. spmat is a collection of commands for creating, importing, manipulating, and saving spatial-weighting matrices.

Spatial-weighting matrices are stored in spatial-weighting matrix objects (spmat objects). spmat objects contain additional information about the data used in constructing spatial-weighting matrices. spmat objects are used in fitting spatial models; see spreg, spivreg (if installed).

These commands are documented in Drukker, Peng, Prucha, and Raciborski (2011) which can be downloaded from http://econweb.umd.edu/~prucha/Papers/WP_spmat_2011.pdf.

References

Drukker, D. M., H. Peng, I. R. Prucha, and R. Raciborski. 2011. Creating and managing spatial-weighting matrices using the spmat command. Working paper, The University of Maryland, Department of Economics, http://econweb.umd.edu/~prucha/Papers/WP_spmat_2011.pdf.

Authors

David Drukker, StataCorp, College Station, TX. ddrukker@stata.com.

Hua Peng, StataCorp, College Station, TX. hpeng@stata.com.

Ingmar Prucha, Department of Economics, University of Maryland, College Park, MD. prucha@econ.umd.edu.

Rafal Raciborski, StataCorp, College Station, TX. rraciborski@stata.com.

Also see

Online: spreg, spivreg, spmap, shp2dta, mif2dta (if installed)