Multiple comparisons among means
OJ Dunn - Journal of the American statistical association, 1961 - Taylor & Francis
OJ Dunn
Journal of the American statistical association, 1961•Taylor & FrancisMethods for constructing simultaneous confidence intervals for all possible linear contrasts
among several means of normally distributed variables have been given by Scheffé and
Tukey. In this paper the possibility is considered of picking in advance a number (say m) of
linear contrasts among k means, and then estimating these m linear contrasts by confidence
intervals based on a Student t statistic, in such a way that the overall confidence level for the
m intervals is greater than or equal to a preassigned value. It is found that for some values of …
among several means of normally distributed variables have been given by Scheffé and
Tukey. In this paper the possibility is considered of picking in advance a number (say m) of
linear contrasts among k means, and then estimating these m linear contrasts by confidence
intervals based on a Student t statistic, in such a way that the overall confidence level for the
m intervals is greater than or equal to a preassigned value. It is found that for some values of …
Abstract
Methods for constructing simultaneous confidence intervals for all possible linear contrasts among several means of normally distributed variables have been given by Scheffé and Tukey. In this paper the possibility is considered of picking in advance a number (say m) of linear contrasts among k means, and then estimating these m linear contrasts by confidence intervals based on a Student t statistic, in such a way that the overall confidence level for the m intervals is greater than or equal to a preassigned value. It is found that for some values of k, and for m not too large, intervals obtained in this way are shorter than those using the F distribution or the Studentized range. When this is so, the experimenter may be willing to select the linear combinations in advance which he wishes to estimate in order to have m shorter intervals instead of an infinite number of longer intervals.
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