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- W2001232274 abstract "The efficiency of stratifying on a risk factor before randomization as opposed to complete randomization and adjustment for the risk factor by post-randomization analysis is examined by calculating the variance of the estimated difference between two treatment means for the two design strategies. This analysis shows that in small samples relying on post-randomization stratification can lead to significant loss in efficiency when compared to prerandomization stratification. In moderate and large samples the two design strategies should have similar variances." @default.
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- W2001232274 title "A note on stratifying versus complete random assignment in clinical trials" @default.
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- W2001232274 doi "https://doi.org/10.1016/0197-2456(82)90026-5" @default.
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