Ben Derrick's Outputs (4)

An outlier in an independent samples design (2018)
Presentation / Conference Contribution

There is a flaw with some of the most commonly performed statistical tests. A paradox of the one sample t-test is the contrariwise decrease in the p-value as the value of an outlier increases in the direction of the overall effect. Demonstration of t... Read More about An outlier in an independent samples design.

Methods for comparing the responses from a Likert question, with paired observations and independent observations in each of two samples (2018)
Journal Article

Assesses the robustness of the partially overlapping samples t-tests for ordinal samples.

Introduces the Derrick-White Type I error robustness criteria.

To preliminary test or not to preliminary test, that is the question (2018)
Presentation / Conference Contribution

Despite the consequences of violations to the assumptions of statistical tests, there is often neglect in published works to report on the assumptions of the tests performed. Preliminary testing the assumptions prior to preforming the test is done ro... Read More about To preliminary test or not to preliminary test, that is the question.

Tests for equality of variances between two samples which contain both paired observations and independent observations (2018)
Journal Article

Tests for equality of variances between two samples which contain both paired observations and independent observations are explored using simulation. New solutions which make use of all of the available data are put forward. These new approaches are... Read More about Tests for equality of variances between two samples which contain both paired observations and independent observations.