Exact Multivariate Permutation Tests for Fixed Effects in Mixed-Models
نویسندگان
چکیده
منابع مشابه
Multivariate and Multiple Permutation Tests
In this article, we consider the use of permutation tests for comparing multivariate parameters from two populations. First, the underlying properties of permutation tests when comparing parameter vectors from two distributions P and Q are developed. Although an exact level α test can be constructed by a permutation test when the fundamental assumption of identical underlying distributions hold...
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Several approximate permutation tests have been proposed for tests of partial regression coefficients in a linear model based on sample partial correlations. This paper begins with an explanation and notation for an exact test. It then compares the distributions of the test statistics under the various permutation methods proposed, and shows that the partial correlations under permutation are a...
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An R package which uses permutation tests to obtain p-values for linear models. Standard R linear model functions have been modified to produce p-values obtained from permutation tests instead of from normal theory. These values are advantageous when the degrees of freedom for error is small or non-existent, as is the case with saturated experimental designs, or when the data is drawn from a no...
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Given independent samples from P and Q, two-sample permutation tests allow one to construct exact level tests when the null hypothesis is P = Q. On the other hand, when comparing or testing particular parameters θ of P and Q, such as their means or medians, permutation tests need not be level α, or even approximately level α in large samples. Under very weak assumptions for comparing estimators...
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Inferences about fixed effects in mixed linear models are important in a variety of animal science studies. The statistical theory for making such inferences is well known, and if the variance components are known up to a proportionality constant, then optimal exact tests can be performed. Computing the test statistics, however, can still be problematic when the random effects have many levels....
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ژورنال
عنوان ژورنال: Communications in Statistics - Theory and Methods
سال: 2012
ISSN: 0361-0926,1532-415X
DOI: 10.1080/03610926.2011.627103