[R] Equivalence test...

From: Andrea Cosacov <acosacov_at_gtwing.efn.uncor.edu>
Date: Wed, 25 Jun 2008 16:59:19 +0200


Dear helpeRs:

I am writting you because I have some doubts in relation to the equivalence test. I am interested in compare seed set of treated plants and control plants. I used the tost command in R, and the value of epsilon that I put was the standard deviation of the control sample. In all cases (because this analysis was performed for five populations) I rejected the null hypothesis and these results were in correspondence with those obtained in a prior ANOVA (all null hypothesis were accepted). My doubt is if it is correct to use the standard deviation (or a percentage of it) of the control sample, to define the interval of equivalence. The second question is how I can obtain a parameter t to report in my results.

Thank you in advance,

Biol. Andrea Cosacov
Instituto Multidisciplinario de Biología Vegetal (IMBIV - CONICET)
Córdoba - Argentina

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