How much bias results if a quasi-experimental design combines local comparison groups, a pretest outcome measure and other covariates?: A within study comparison of preschool effects.
Keyword(s):
Keyword(s):
1994 ◽
Vol 79
(1)
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pp. 11-15
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Keyword(s):
2019 ◽
Vol 2
(5)
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pp. 220