anova assumption

  1. P

    Geisser-Greenhouse Correction Nonsignificant Effect

    I've read several pieces of documentation that say that the Geisser-Greenhouse correction for sphericity always increases the p value. I've noticed in SPSS that if a test is not significant (before any correction), sometimes the Geisser-Greenhouse corrected value is actually less than the...
  2. P

    Repeated Measures ANOVA as Linear Mixed Model

    Hi there, I have a study in which one group of subjects are completing a face recognition task with an eye tracker. First, they learn a set of faces, one at a time. In the testing phase they are tested on their memory for those faces, one at a time, with some faces being targets and others...
  3. R

    Is Kruskal Wallis really needed?

    Dear all, I really do not see why we need Kruskal-Wallis test at all. In terms of the distribution, only platykurtic distribution may increase type 1 error. When the break the homogeneity of variance we could use Welsh or Borwn-Forsythe. We have a posthoc test suitable for all types of data...
  4. M

    F statistic values more than 1000 (sample like 2000 and 5000 )

    I am studying the water parameters from three different groups. I performed ANOVA and found for few parameters F value was way high to report. I understand high value explains variance very well between groups. But can i report such values to scientific society. The parameters concerned...
  5. K

    ANOVA for temporal factor data - Data thinning to avoid autocorrelation/dependence?

    Hi all I am conducting an analysis to assess the temporal occurrence of a species of whale in our survey area at different time scales using sightings per unit effort (SPUE, number of sightings per hour of effort) data. I am running separate ANOVA’s for each of the factors of Survey Week (18...