1period,n,intercept,slope,slope_se2full 1960Q1-2019Q4,240,0.18438835418210714,-0.2557677277487258,0.035834633302965693sub1 1960Q1-1983Q4,96,0.2542326539884382,-0.25902105345680587,0.039286808289598634sub2 1984Q1-2019Q4,144,0.15168581347724602,-0.27339263306757905,0.068314287937380235