随机效应模型试验序贯分析中研究间方差估算方法的比较研究

Comparison study of estimators of between-trial variance in trial sequential analysis for random-effects model

固定效应模型的假设前提是各项研究的真实效应值是相同的,而随机效应模型的假设前提是各项研究的真实效应呈正态分布。随机效应模型下总方差是研究内方差与研究间方差之和,而研究间方差的估算方法有多种,各有优缺点。本文简要介绍随机效应模型试验序贯分析中研究间方差的估算方法,并对其进行比较研究。

The assumption of fixed-effects model is based on that the true effect of the each trial is same. However, the assumption of random-effects model is based on that the true effect of included trials is normal distributed. The total variance is equal to the sum of within-trial variance and between-trial variance under the random-effects model. There are many estimators of the between-trial variance. The aim of this paper is to give a brief introduction of the estimators of between-trial variance in trial sequential analysis for random-effects model.