Work without shapefile

Hi to everyone.
I state that I am new to Spatial Econometrics.
My data set is composed of 32 gasoline stations and show the price for 151 consecutive days, longitude and latitude for each station and a series of other variables. These stations belong to 2 zones (called "Municipi") of Rome.

When I run the command

Code:

spset

I get the following:

Code:

Sp dataset roma_V_VI_covariates.dta
                data:  panel
     spatial-unit id:  _ID (equal to idstation)
             time id:  date (see xtset)
         coordinates:  _CY, _CX (latitude-and-longitude, kilometers)
    linked shapefile:  none

The next step is to create spatial weighting matrices.
But without linked shapefile, I cannot create a contiguity matrix. I can create just an inverse distance matrix.

It is possible to perform any spregression without contiguity matrix?

Note: I translated shapefile in dta but I cannot merge it with my master data because there is no variable to match.

thanks for your help.

Mario