help spmat lag
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Title

    spmat lag -- Create a spatial lag variable


Syntax

        spmat lag [type] newvar objname varname


Description

    spmat lag creates a new variable that is a product of the
    spatial-weighting matrix contained in the spmat object objname and the
    variable varname.  Algebraically, spmat lag computes W*y, where W is the
    spatial-weighting matrix and y is the variable.

    The default storage type is float. Specify double for the type to store
    the result in double precision.


Example

    Setup
        . use pollute
        . spmat use cobj using pollute.spmat

    Create the variable pollution_w containing a spatial lag of variable
    pollution
        . spmat lag double pollution_w cobj pollution


Also see

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