[ECOLOG-L] planned contrasts replacing 2-way ANOVA

I am planning a 2x2 factorial experiment whe Dear list members, I am planning a 2x2 factorial experiment where I record several response variables to test several hypotheses. Some of these hypotheses can be tested using the usual 2-way ANOVA. That is, the significance or non significance of th

Re: [ECOLOG-L] planned contrasts replacing 2-way ANOVA

To: ECOLOG-L@LISTSERV.UMD.EDU Subject: [ECOLOG-L] planned contrasts replacing 2-way ANOVA I am planning a 2x2 factorial experiment whe Dear list members, I am planning a 2x2 factorial experiment where I record several response variables to test several hypotheses. Some of these hypotheses can be

Re: [ECOLOG-L] planned contrasts replacing 2-way ANOVA

There should be no problem with using a priori contrasts. No adjustment of the p-value is required, UNLESS the contrasts are non-orthogonal, which is often the case when more than two hypothesis tests. If the contrasts are not orthogonal, some type of adjustment (e.g. Bonferroni) is requi