kruskal-wallis

  1. G

    Stepweise step down post hoc test for Kruskal-wallis in SPSS

    Hello, What are the criteria for computing the pairwise or the stepwise step-down comparison in SPSS after Kruskal-Wallis? I know that the pairwise comparison is more conservative than the stepwise comparison, but are there any other criteria to decide which post-hoc test to use? Does anybody...
  2. D

    Which method? Categorical data (IV) and continuous numerical data (DV)

    Thanks in advance for taking a look at my query I have been trying to get some statistical support from my local research department but I am getting conflicting opinions on which statistical methods I should be using to analyse my data. Any thoughts or insights would be much appreciated...
  3. Z

    Kruskal-Wallis or Poisson regression for parasite count data?

    Trying to figure out how best to carry out this analysis... So essentially I have four different species of Deer mice, infected with a high, medium, or low dose of parasite eggs. After euthanasia, I recovered larvae from different tissues of each mouse to compare differences in numbers recovered...
  4. N

    Difference between samples in terms of frequency ranks

    I have 3 different texts, and for each one of them, I have the frequencies of 25 letters appearing in those texts (Text A, letter A, freq = 5013; Text A, letter B, freq = 1462,...). These texts have different, and not normal distributions. I would like to know, if there's any significant...
  5. L

    [Prism 5] Gather or Individual Analysis? ANOVA or Kruskal?

    To whom it may help: My research is on cellular/molecular responses after hormones farmacological administration and I'm not quite sure how to perform statistical analysis. I have 15 test groups plus my control group (DMEM) and I did my experiments two different times (2 occasions) in...
  6. M

    0.00000 significance value

    Hi everyone, New to Talk Stats, so be nice! I have looked for an answer to my problem on previous posts but have not been able to find anything suitable. Basically I am comparing the data between three different groups who have all performed a particular type of examination. I have carried...
  7. L

    dunn.test

    Hi everyone!! I'm quite new with R, so I hope you can help me :) I'm working with bacteria pyrosequencing data and I'm doing the statistical analysis with R. I have 21 samples and 7 different treatments. I loaded my data into R phyloseq obtaining: > psR phyloseq-class...
  8. M

    GLM with non-parametric post hoc testing?

    Hi guys, I have a question regarding the appropriate use of comparisons for independent samples (3 factor levels), please. Overall sample size is N=546, subsamples: 218 or 228 or 100), convenience sampling, stratified. I use ANOVA with post hoc Tukey, if Levene indicates variance...
  9. H

    Kruskal-Wallis = significant but post-hoc doesn't show any sig results...

    Hi everybody, really hoping somebody can tell me if I'm missing something obvious here. I've run a Kruskal-Wallis test on SPSS using the Analyze-Nonparametric-Independent Samples route and the Hypothesis Test Summary box tells me to reject the null hypothesis (sig=.003). However when I double...
  10. P

    Kruskal Wallis - Specific multiple comparisons

    Dear all, I'm new to the board, but I hope you're able to help me. I'm using SPSS for my statistics. My outcome is scale variables (eg height, weight, etc.) - a total of 20 different variables. I have 8 different groups where I need to test 8 relevant combinations per variable. My first...
  11. J

    Kruskal-Wallis, assumption of non-homogeneity

    Hello there, I am trying to do a Kruskal-Wallis test, but I am finding that some of my data sets do not satisfy the assumption of homogeneity of variances. What am I supposed to do in this situation? Let me provide some background on my analysis. I am looking at changes in shipping...
  12. J

    SPSS - Mann Whitney U Test help.

    Hi everyone, Just doing some stats on SPSS, which I am new to. The question I have to answer is; Select the correct statistical technique to test the hypothesis there there is no difference in systolic blood pressure due to aerobic exercise training lasting 6, 12 and 24 weeks. There a...
  13. G

    comparing multiple (12) Likkert-Items - Kruskal-Wallis-Test (?)

    Dear all, I already found useful information to calculate my tests however minor questions are left. I have a data-set of around 200 participants in 4 groups, unequally distributed. For every participant I have 12 Likert-Items (called A_219 to A_230) To compare these Items with each other I...
  14. M

    Different results between Kruskal-wallis test and multiple comparison after Kruskal-w

    Hello all, I used Kruskal Wallis test to compare three data groups pra testar comparações em três grupos (b,c,s). The p-valor was < 0,05 in all cases (So, there is difference among at least two groups ). So, I compared pair the paires of groups (to know how groups are different) and it...
  15. J

    Rank correlation - Comparing multiple sets of ranked metric values

    Rank correlation - Comparing multiple sets of ranked metric values First, I would like to thank the mods and experts who maintain and answer questions on this forum. Second, I really appreciate the fact that you reply to people who place "Please Help ME!!" in the subject line despite the fact...
  16. M

    [non normal Multiple sample comparison] analysis and error bars for medians

    Dear all, Background: Treatment applied to 10 groups of different sizes. Each group treated with a different concentration. Groups 9 and 10 are control/sham and represent the negative outcome. Samples in each group are independent. Group numbers vary from 12 to 4 (I cannot increase the...
  17. B

    Differences in responses on a 5 point scale between three groups? Kruskal-Wallis?

    Dear madam/sir, Recently I have designed a course that was run at three different locations. To know what the students thought of the course they were given the same questionnaire on all three locations. One of the questions as an example was to indicate the extend to which they agreed with the...
  18. P

    Count data, NP, between group post hoc comparisons in SPSS

    Some simple advice on non-parametric analysis needed... When comparing sets of count data, i.e. 6 treatments (independent var) applied to 30 samples per treatment, and the result is a count (dependent var) how are differences between treatments checked for in SPSS, i.e. a post hoc...
  19. M

    Non-parametric test equivalent to two-way anova?

    Hi everyone. I have a question on non-parametric tests that replace anova tests. In my first data set, I have scat density data grouped according to habitat type. I have used Kruskal-wallis instead of one-way anova since it is a non-parametric test which does not assume normal distribution...
  20. D

    Using ANOVA for comparing perceived emotions in reaction to an embodied agent

    Hi there, I stumbled upon an interesting paper on "The Influence of Emotions in Embodied Agents on Human Decision-Making" by de Melo, Carnevale & Gratch. Basically they ran and experiment where they used different versions of an embodied agent (a cooperative vs. an individualistic agent) in a...