using spset

[Tom Hyclak]

When I use spset on my data the response correctly identifies the data as panel. When I the try to change from planar coordinates to latitutde longitude with spset, modify coordsys(latlong, miles) the response now indicates that the data is cross section. What am I doing incorrectly?

[Tom Hyclak]

Here are my commands. Why does spset, modify see the data as cross section?????

xtset zip year
panel variable: zip (strongly balanced)
time variable: year, 2000 to 2021
delta: 1 unit

. spset zip, coord(lat E)
Sp dataset Core estabs spatial data.dta
data: panel
spatial-unit id: _ID (equal to zip)
time id: year (see xtset)
coordinates: _CX, _CY (planar)
linked shapefile: none

. spset zip, modify coordsys(latlong, miles)
option coordsys() not allowed
r(198);

. spset, modify coordsys(latlong, miles)
Sp dataset Core estabs spatial data.dta
data: cross sectional
spatial-unit id: _ID (equal to zip)
coordinates: _CY, _CX (latitude-and-longitude, miles)
linked shapefile: none