5 edition of Distribution-free statistical tests. --. found in the catalog.
Includes bibliographical references.
|Statement||Wright Air Development Division, Air Research and Development Command, United States Air Force|
|Publishers||Wright Air Development Division, Air Research and Development Command, United States Air Force|
|The Physical Object|
|Pagination||xvi, 122 p. :|
|Number of Pages||62|
|2||WADD Technical report, 60-661|
nodata File Size: 3MB.
Those tests both assume that the population data has a normal distribution. It also turns out that many statistical tests are robust, which means that they maintain their statistical properties even when assumptions are not entirely met.
Use MathJax to format equations. A Type I error occurs when a test incorrectly rejects the null hypothesis. Thanks for contributing an answer to Cross Validated! The distance swimmers appear to be the athletes that differ from the others in terms of anaerobic thresholds.
For this example, the critical value is 1, and the decision rule is to reject H 0 if the smaller of the number of positive or negative signs 1. Transformations are generally less effective for reducing kurtosis than for reducing skew. Here we observe 3 negative signs and thus 9 positive signs.
Select the appropriate test statistic. It can sometimes be difficult to assess whether a continuous outcome follows a normal distribution and, thus, whether a parametric or nonparametric test is appropriate.
Situation 1 Consider the situation where there is complete separation of the groups, supporting the research hypothesis that the two populations are not equal.
distribution free methods, which do not rely on assumptions that the data are drawn from a given probability distribution. For each pair, one score is subtracted from the other score. This section shows how to compute a significance test for a difference in proportions using a randomization test. If your data isn't normally distributed, you can't run an ANOVA, but you can run the nonparametric alternative the Kruskal-Wallis test.
You want to test for the median rather than the you might want to do this if you have a very. In the Kruskal Wallis test we again summarize the sample information in a test statistic based on the ranks. Low power is a major issue when the sample size is small - which unfortunately is often when we wish to employ these tests.
We run the test using the five-step approach.
I have a quiz I give my Black Belt students after covering nonparametric tests.
Parametric tests involve specific probability distributions e.