Some Unexplained Aspects of Analysis of Covariance in Pretest-Posttest Studies. Ganju, J. Biometrics, 60:829-833, 2004. bibtex @article{gan04som,
title = {Some Unexplained Aspects of Analysis of Covariance in Pretest-Posttest Studies},
volume = {60},
journal = {Biometrics},
author = {Ganju, Jitendra},
year = {2004},
keywords = {ancova,change,change-scores,conditional-analysis,fixed-random-baseline-measurement},
pages = {829-833},
citeulike-article-id = {13265393},
posted-at = {2014-07-14 14:09:55},
priority = {0},
annote = {"adjusting for the pretest variable in observational studies may actually introduce bias where none previously existed"}
}