1. State specific cohort trend, county pre-treatment characteristics trend. Description of variables and regressions: This paper studies the effect of food stamps programs on long-run health outcomes. Heterogeneous: Yes;Whitmore Hoynes;Dimensions: Individual � County � Birth year Description of factor control: Unit time trends & Covariate time trends,2009
2. Covariate time trend (Table 2, Column 5) Dummy factor (Table 3, Column 1, Table 4, Columns 1-4, Table 5, Columns 1-4, Table 6, Columns 1-4) Dimensions: Industry � year;Schott Pierce;Description of factor control: Covariate time trend (Table 2, Column 5): ln(RDGP ) t � ln(N P/Emp i,t ), effectively a GDP factor interacted with a covariate. Dummy factor (Table 3, Column 1): Country � time, Country � industry, Industry � year (Table 4, 5, 6) Product � country, Country � time,2009
3. Table 11, Table 13, Table 18, Table 19, Panel B), ? TWFE (Table 15) Dimensions: Trade Gap � Year Description of factor control: None. Description of variables and regressions: This paper studies the effect of tariff changes on trade and bribery;Sequiera;Corruption, Trade Costs, and Gains from Tariff Liberalization: Evidence from Southern Africa DiD: Table 5,2016