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A Two-Stage Estimation Procedure when There May be Spurious Observations
可能存在异常观测时的两阶段估计程序
In laboratories where blood samples are analyzed, it is common to use a two-stage procedure for estimating a reaction time. The procedure consists of making two independent determinations and if they differ by more than d units, a third determination is made. In the case of a third determination, one of the first two is discarded and the estimate is the average of the retained observations. Assuming that each observation is, with some probability, a spurious one the bias and…
A two-stage estimation procedure when there may be spurious observations
可能存在异常观测时的两阶段估计程序
In laboratories where blood samples are analyzed, it is common to use a two-stage procedure for estimating a reaction time. The procedure consists of making two independent determinations and if they differ by more than d units, a third determination is made. In the case of a third determination, one of the first two is discarded and the estimate is the average of the retained observations. Assuming that each observation is, with some probability, a spurious one the bias and…
Simple Regression Methods for Survival Time Studies
生存时间研究的简单回归方法
Given a set of grouped survival data, least squares estimates are proposed for the parameters of four survival distributions that can be fit: exponential, linear hazard, Gompertz and Weibull. Sample estimates of the hazard function are utilized in the least squares procedures and a method is given for selecting a distribution for further investigation based on the likelihood under the four survival models. A Monte Carlo study demonstrated that the least squares estimates are…
The Performance of Some Two-Sample Tests in Small Samples With and Without Censoring
有删失与无删失小样本中若干两样本检验的表现
The power curves of three two-sample tests are compared in small samples from the exponential and four forms of the Weibull distribution with and without censoring. The tests considered are: F ratio, modified F ratio (F′ test), and a generalized Wilcoxon test (W test). Monte Carlo methods are used to obtain power curves for each test with sample sizes 20 and 50. The F test is known to be most efficient when sampling is from exponential distributions. If sampling is from…
The performance of some two-sample tests in small samples with and without censoring
The power curves of three two-sample tests are compared in small samples from the exponential and four forms of the Weibull distribution with and without censoring. The tests considered are: F ratio, modified F ratio (F′ test), and a generalized Wilcoxon test (W test). Monte Carlo methods are used to obtain power curves for each test with sample sizes 20 and 50. The F test is known to be most efficient when sampling is from exponential distributions. If sampling is from…