period,n,intercept,slope,slope_se
full 1960Q1-2019Q4,240,0.184388,-0.255768,0.035985
sub1 1960Q1-1983Q4,96,0.254233,-0.259021,0.039217
sub2 1984Q1-2019Q4,144,0.151686,-0.273393,0.068794