combinIT

There are several non-functional-form-based interaction tests for testing interaction in unreplicated two-way layouts. However, no single test can detect all patterns of possible interaction and the tests are sensitive to a particular pattern of interaction. This package combines six non-functional-form-based interaction tests for testing additivity. These six tests were proposed by Boik (1993) doi:10.1080/02664769300000004, Piepho (1994), Kharrati-Kopaei and Sadooghi-Alvandi (2007) doi:10.1080/03610920701386851, Franck et al. (2013) doi:10.1016/j.csda.2013.05.002, Malik et al. (2016) doi:10.1080/03610918.2013.870196 and Kharrati-Kopaei and Miller (2016) doi:10.1080/00949655.2015.1057821. The p-values of these six tests are combined by Bonferroni, Sidak, Jacobi polynomial expansion, and the Gaussian copula methods to provide researchers with a testing approach which leverages many existing methods to detect disparate forms of non-additivity. This package is based on the following published paper: Shenavari and Kharrati-Kopaei (2018) "A Method for Testing Additivity in Unreplicated Two-Way Layouts Based on Combining Multiple Interaction Tests". In addition, several sentences in help files or descriptions were copied from that paper.

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