(mean) GOV_min
(mean) GOV_npty
=real_GDP_gr_orig_PWT, but 1951-70 DEU gr=av(NTH, SWI)
(mean) real_GDP
soviet_milex_def_growth, =0 if soviet_g<us_g
=wars_pact_milex_def_growth, but 0 if wars<US
# of borders with WP states
=1 if number_borders_with_WP>0 &  number_borders_with_WP<.
# of borders or <500 miles sea with WP states
milex_gdp in first 3 years of sample
=1 if number_contiguity_with_WP>1
(mean) SE_var_main_contig_w