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AI 根据所提供的论文材料归类:摘要研究回归函数的多重比较,未提供因果识别、面板或其他所列方向的依据。

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关注这篇论文的作者
John D. Spurrier

三条及以上回归直线所有对比的精确置信界

研究问题
比较三个及以上处理组时,如何对各组简单线性回归函数的所有对比构造同时置信界,并减少 Scheffé 方法的保守性?
方法与思路
作者在独立同分布正态误差及各组设计矩阵相同的条件下采用并交方法,以分布函数为 F 分布函数线性组合的枢轴量构造界。
材料陈述的贡献
摘要称所得精确界可用标准软件计算,并报告特定组数下 Scheffé 界更宽;这些比较依赖所述回归与设计条件。
阅读关注点
应核对同时覆盖涉及的对比集合、自变量范围和误差设定,检查枢轴量分布及临界值计算,并确认界宽比较的具体场景。
阅读边界
仅据版本未注明的 OpenAlex 索引摘要;设计不相同或非正态误差下的有效性未说明,处理组比较本身不建立因果解释。

原文摘要

It is desired to compare κ ≥ 3 treatments. Under the assumption of iid normal errors, it is well known that the Scheffé method produces exact simultaneous confidence bounds for all contrasts of the treatment means. Furthermore, it is known that the Scheffé method is conservative when one desires confidence bounds for a specific subset of contrasts of means. Exact methods, such as those due to Tukey and Dunnett, yield tighter bounds than the Scheffé method for specific subsets of contrasts of means. In this article, multiple comparisons of the κ treatments are done not in terms of their means, but rather in terms of a parametric function. The parametric function of interest is the simple linear regression model, E(Y|x). It is desired to find simultaneous confidence bounds for all contrasts of the κ simple linear regression models. Although the Scheffé method can be used to find such bounds, this is extremely conservative. The union-intersection method is used to develop simultaneous confidence bounds for these contrasts under the assumption of equal design matrices for each treatment. The method is based on a pivotal quantity whose distribution function is a linear combination of F distribution functions. Thus probability points can be computed using standard computing packages. The Scheffé bounds are about 5% wider than the exact bounds for κ = 3 and about 13% wider for κ = 6.

笔记与分组
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