tukey hsd

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    Help understanding tukey test difference of means.

    Hi all, I am using a Tukey test, posthoc analysis to look at the differences of means between 2 sample groups. My question is that I have one goofy comparison between 1 plot that received one treatment and 39 other plots that did not. I got a Standard Error for the difference of means. I...
  2. M

    P-Value in overall ANOVA vs. TukeyHSD

    Hey Everyone, I've been learning stats on the side and have some difficulty understanding the different methods of comparing means. I used R and would have posted in their forum, except this is more theory. When I used the anova function on a data set, I got a low p-value and high F -...
  3. P

    Within subjects ANOVA pairwise comparisons - is there a way to use TUKEY HSD?

    Hi I am running a 3 x 4 repeated measures within subjects ANOVA - the options SPSS gives me for the pairwise adjustments is LSD, Bonferonni and Sidak. However, I need to run post hoc using TUKEY HSD. I tried changing bonferroni for TUKEY in the syntax but to no avail. Just to emphasise, I am...
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    Controlling for Type 1 Errors: Post-hoc testing on more than 1 ANOVA

    I have conducted several repeated-measures ANOVA's with post-hoc testing via Tukey's HSD whenever the omnibus F-test was significant. I'm having some confusion about controlling for type 1 errors when presenting these post hoc tests. Q1: It's my understanding that Tukey's HSD will control the...
  5. S

    ANOVA, Tukey HSD, R

    Hi, I have 8 experimental datasets, 24 data points in each, which I compared using ANOVA followed by post hoc Tukey's HSD, using R. They are OK for the ANOVA assumptions. I found significant differences at 0.01 level between two of the groups and everything else, nothing else was...