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Factorial design with two qualitative factors

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The attachments contain examples of two-way analysis of variance with two qualitative factors.

As part of the analysis we perform the Levine test and also the Levine (Med) test of homogeneity of variances. Please note that various publications focus on the test for one-way analysis of variance, and we provide the R code for the two-way analysis of variance.

asphalt.zip1.46 KB