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m →Formal definition: Small correction on subscript indentation |
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n_s & = \text{ number of individuals in group } s \\
\overline{y}_{st} & = \frac{1}{n_s} \sum_{i=1}^n y_{it} \ I(s(i) ~=~ s), \\
\overline{\gamma}_s & = \frac{1}{n_s} \sum_{i=1}^n \
\overline{\lambda}_{st} & = \frac{1}{n_s} \sum_{i=1}^n \lambda_t \ I(s(i) ~=~ s) ~=~ \lambda_t, \\
D_{st} & = \frac{1}{n_s} \sum_{i=1}^n I(s(i) ~=~\text{ treatment, } t \text{ in after period}) \ I(s(i) ~=~ s) ~=~ I(s ~=~\text{ treatment, } t \text{ in after period}) , \\
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