mann whitney

  1. M

    Wilcox test with median 0

    Hello, I am trying to run an analysis on differences in female and male aggressive behaviours in an animal species. My data is non-normally distributed and it's both numeric and categorical, so I assumed the Wilcox test will be sufficient. However, all medians come back as 0 and my box and...
  2. L

    Which tests to use in these examples? Wilcoxon etc.

    I'm pretty clueless, but would appreciate any help very much. I have: Group 1: went from nothing, to receiving surgery 1, and then later on received surgery 2. -> A (before), B (after first surgery), C (after second surgery) Group 2: went from nothing to receiving surgery 1 -> A...
  3. R

    Chi square Or Mann U Whitney for comparing student grades

    Hi, for my study I have obtained the UK classification grades that are used at University. I've obtained data from two groups of students first generation and continuing generation. I want to see if there is a difference I'n grades between the groups. The problem I have is that I've obtained...
  4. J

    non parametric multiple pairwise comparisons - which correction is allowed?

    Hello all, I have a data set from plant experiments with only 4 replicates. data are numbers of mites after different treatments. Because the datasets are small they are not normally distributed, so I use non parametric tests: Wilcoxon. First I did a pairwise comparison, without corrections...
  5. N

    Having a hard time deciding on what test to use for data

    Here is the premise: There are large events taking place on park land. We are using noise disturbance hardware to measure decibels during and not during events. We have >1000 samples for our control and our experimental. The data is not normally distributed. The variances are different...