Ilyssa wonders
Question: In Table 4.1.1 (p. 124), how are there 30 instruments in Column 8 rather than 27 (= 3 qob dummies * 9 year of birth dummies)?
Why indeed? There are still 3 QOB main effects.
JA
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QOB Qonfusion
Ilyssa wonders
Question: In Table 4.1.1 (p. 124), how are there 30 instruments in Column 8 rather than 27 (= 3 qob dummies * 9 year of birth dummies)?
Why indeed? There are still 3 QOB main effects.
JA