fix formula issues - Githubissues

naoki-egami / DIDdesign

R package DIDdesign: Analyzing Difference-in-Differences Design

GNU General Public License v2.0

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Closed sou412 closed 5 years ago

sou412 commented 5 years ago

fix issues around formula input:

Previously any transformations of covariates such as I(x^2) or as.factor(x) are not properly reflected.
Update a method to handle formula input. Now the original input is passed through plm fit so that variable transformations are reflected in the estimation stage.