Disclaimer: Undergrad student learning how to use SAS So I'm doing proc panel using data that looks like this Year State Vehicle Miles Traveled per driver Population Density Centerline Miles Density Lane Miles Density 2002 Alabama 16074.68559 88.58738276 1.86462632 3.863757528 2003 Alabama 16296.9555 88.86863461 1.86462632 3.863816764 2002 Alaska 10193.7351 1.128180415 0.024740599 0.050168144 2003 Alaska 10264.0362 1.136998568 0.024936869 0.050550171 I use the following to get some coefficients proc sort data=WithInteractionEffects; by state year; run; proc panel data = WithInteractionEffects; id state year; model vehicle_miles_traveled_per_drive = population_density centerline_miles_density lane_miles population_centerline_density population_lane_density centerline_lane_density; run; I want to include by state; So that it will give me regression coefficients for each state rather than just the whole thing. Currently, when I try that it gives me ERROR: There is only one cross section or time series observation. Computations will be terminated So is there a way to achieve the result that I want?
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