IMPACT OF STRATIFICATION IMBALANCE ON PROBABILITY OF TYPE-I ERROR

被引：0
|
作者：
KAZEMPOUR, K
机构：
来源：
AMERICAN STATISTICIAN | 1995年 / 49卷 / 02期
关键词：
ANALYSIS OF COVARIANCE; BASE-LINE ADJUSTMENT; PRETEST-POSTTEST;
D O I：
10.2307/2684632
中图分类号：
O21 [概率论与数理统计]; C8 [统计学];
学科分类号：
020208 ; 070103 ; 0714 ;
摘要：
The impact of ignoring the stratification effect on the probability of a Type I error is investigated. The evaluation is in a clinical setting where the treatments may have different response rates among the strata. Deviation from the nominal probability of a Type I error, alpha, depends on the stratification imbalance and the heterogeneity in the response rates; it appears that the latter has a larger impact. The probability of a Type I error is depicted for cases in which the heterogeneity in the response rate is present but there is no stratification imbalance. Three-dimensional graphs are used to demonstrate the simultaneous impact of heterogeneity in response rates and of stratification imbalance.
引用
收藏
页码：170 / 174
页数：5
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