Summary statistics of global Moran's I for spatial autocorrelation of county population counts within each combination of state and year.

moran_exp and moran_obs are respectively the expected Moran's I and the observed Moran's I. p_ran and z_ran are respectively the p-value and the z score calculated from the randomization null hypothesis test (with undefined values denoted by NA). num_county is the number of counties.
(XLSX)