Moran's I in Stata

[Dario Maimone Ansaldo Patti]

Dear all,

I have two questions:

1) I generated a spatial weights Matrix using spmat. I need to calculate the Moran's I. Do you have any hint on how to do that?

2) Is it possible to generate a .dta file containing the spatial weights I generated with spmat?

Thanks in advance

Dario

[Marcos Almeida]

Hello "dmaimone",

I'm not acquainted with the SJ spmat. That said, according to the article published in The Stata Journal (Creating and managing spatial-weighting
matrices with the spmat command, 2013, 13, Number 2, pp. 242–286), you can save the object by typing:

. spmat save objname using filename [, replace]

Also,

spmat dta imports a spatial-weighting matrix from the variables in a Stata dataset and
stores it in an spmat object.

Finally, the option

saving(filename[ , replace]) saves the neighbor list to a space-delimited text file. The first line of the file contains the number of units and, if applicable, bands; each remaining line lists a unit identification code followed by the identification codes of units that share a common border, if any. You can read the file back into an spmat object with spmat import ..., nlist. replace allows filename to be overwritten if it already exists

Hopefully that helps.

[Dario Maimone Ansaldo Patti]

Hi Marcos. Thanks for your reply. Apparently it is not possible to Save the matrix in dta format, which is required to use spatgsa routine. However o found a solution at this link: http://www.stata.com/statalist/archi.../msg00792.html

Best

Dario

[Marcos Almeida]

Thanks for sharing the CODE, Dario. By the way, as you may well know, Maurizio Pisati has authored several user-written programs related to spatial analysis in Stata.

[Dario Maimone Ansaldo Patti]

Indeed. They are incredibly useful!

Best

Dario