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Journal Article

Violating Ignorability of Treatment by Controlling for Too Many Factors

Jeffrey M. Wooldridge
Econometric Theory
Vol. 21, No. 5 (Oct., 2005), pp. 1026-1028
Stable URL: http://www.jstor.org/stable/3533523
Page Count: 3

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Topics: Contrafactuals, Econometrics
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Violating Ignorability of Treatment by Controlling for Too Many Factors
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Abstract

This problem shows how the key ignorability-of-treatment assumption used in estimating treatment effects can be violated when certain factors are included among the covariates. The case considered is when there are J + 1 treatment levels, treatment is randomized with respect to potential outcomes, but the distribution of included covariates differs across treatment levels.

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