post-hoc

  1. V

    Post Hoc Analysis

    Hi, I am having trouble running a post-hoc analysis as I keep recieving the message: "Post hoc tests are not performed for EmpathyMean/AltruismMean because at least one group has fewer than two cases." I am trying to compare the means between two independent variables (Altruism & Empathy) and...
  2. B

    Friedman post hoc Conover - 2 formulas?

    I'm trying to figure out the post-hoc procedure from Conover for a Friedman test. Unfortunately I do not have a copy of the original book 'Practical Nonparametric Statistics' and it seems a bit expensive. So I've been googling and came across two different formula's both claiming to have Conover...
  3. N

    Post-Hoc Power Analysis (G*Power) for simple linear regression

    Hey everyone! I conducted a simple linear regression with non-significant results. Now I would like to analyze the power of this calculation using G*Power. I chose the option "F-tests - Linear multiple regression, fixedmodel, R(2) deviation from zero and entered 1 as my numer of predictors...
  4. J

    Engineering research tests: comparing post hoc data and paring

    Hello - I have several tests to do but my stats is a bit rusty... They are all based on the deflection of different beam designs: Test 1 Beam design A (n=4) is loaded and deflection measured Beam design A (n=4) is loaded, but with a changed contact, and deflection measured Test 2 Beam design B...
  5. B

    Option for post-hoc test after permanova for community data?

    Hi there, Thank you for reading my post and hopefully someone can provide me with some help! For my master's thesis, I have used microbial community identification with QIIME. I have 47 samples spread over 4 different treatments and 4 different time points (2 different years and 2...
  6. C

    Planned Contrasts following MANOVA and RM ANOVA

    Hello, Im not sure I will get much help on this but this is a last resort. DESIGN I have 2 Independent Variables: 1) Group (Experimental and Control) 2) Time (Baseline, Post-Intervention, Follow-up) I have 3 Dependent Variables: 1) IS 2) HS 3) RS Group is the between-subjects factor. Time is...
  7. M

    chi-square test of independence sig but all post-hoc not--how to report?

    I am conducting chi-square tests of independence and for any that are significant I am conducting Bonferroni adjusted post-hoc tests. I have a couple of cases where the original test is significant but none of the post-hoc tests are significant. What is the correct way to report this?
  8. E

    McNemar's test post-hoc power analysis problem when odds ratio=0

    I need to do post-hoc power analysis for a McNemar's test (using G*power), and am having trouble getting results. One of the discordant pairs is 0, therefore the odds ratio is zero, and it seems that power cannot be calculated using an odds ratio of 0. Is there any way around this...
  9. S

    When is data 'nearly normal' - enough to break parametric rules

    Hi everyone, I am a student who has carried out a renewable energy experiment for a dissertation project. My dependent variable is total biogas production. I designed an experiment to hopefully look at the influences on biogas production of pre-treatment (Yes or No), Enzyme (Yes or No) and...
  10. N

    Analysis and Post-hoc for Ordinal Variables

    My main questions are; 1) For a Chi goodness of fit test, which effect size do you use? I am being told Cramer's V, Phi, Omega and W! (There seem to be a lot more answers for a Chi association test, but not for a Chi goodness of fit) 2) Can you use an Odds Ratio with a Chi goodness of fit...
  11. N

    Theoretical questions about Chi goodness of fit & Fisher's Exact tests

    Hello statisticians, My main questions are; 1) For a Chi goodness of fit test, which effect size do you use? I am being told Cramer's V, Phi, Omega and W! (There seem to be a lot more answers for a Chi association test, but not for a Chi goodness of fit) 2) Can you use an Odds Ratio...
  12. N

    Post-hoc analysis for Fisher's Exact Test

    Hello all! I am using Fisher's Exact Tests to analyse a series of 2x2 contingency tables with small values. But are there any other tests I can use to say more interesting things about my results? (I am thinking of post-hoc tests, or possibly Kramer's V or Odds Ratio or other things that can...
  13. I

    Repeated Measures unable to Post-hoc

    I am trying to run a mixed ANOVA; 2 fixed factors (mouse strain [Strain] and drug treatment [Treatment]) and 1 repeated factor (gas challenge, performed in series [Breath]). The ANOVA end of things runs fine, but I am crippled at the post-hoc level. Any time I try to run an LSMEANS or MEANS...
  14. M

    SPSS v21 - MANCOVA post-hoc test - post-hoc box grayed out

    Hi everyone, I'm looking to run a Tukey post-hoc test in GLM-->Multivariate with covariates (MANCOVA). When I add covariates I can no longer select "post-hoc" - the box is grayed out. Also, I can't click "compare main effects" in the options tab. Why is this? I have seen a thread...
  15. L

    Three-way ANOVA interaction: Post-Hoc tests

    Hi There, I have a 2x3x4 repeated measured anova. I have a significant 3-way interaction, and I want to make sure that I am using the correct post hoc comparisons and not violating any key statistics theory. If we consider my 2x3x4 RM ANOVA to be AxBxC. With the significant 3-way interaction...
  16. H

    Do post-hoc tests take repeated measures into account?

    Hi, I've tried finding an answer to this question but can't find one anywhere :-/ If you perform a repeated measures design experiment (for example blood pressure of 5 patients before, during and after a procedure) and get a significant repeated measures ANOVA omnibus effect, do the possible...
  17. J

    deriving critical level of significance for Bonferroni correction in my data?

    We have conducted an experiment where we test ability to detect weights using two different methods using a repeated measures design. Each participant is asked to detect which weight is heavier between two given weights with weight increased by few percentage, so 4 different weight comparisions...
  18. E

    Choosing correct post-hoc test for my data in SPSS

    Hey everyone! I'm currently working on an observational study looking at differences in heart rate and blood pressure variability in heart failure patients. It's a very large study with 500+ patients, and we are comparing the heart rate and blood pressure between the sexes, between...
  19. A

    Three-way mixed ANOVA - Post-hoc-analysis (Scheffé-test?)

    Hello everybody, I hope someone is able to help me here, because I'm desperate and can't find help anywhere :-(. English is not my first language, so please excuse any errors. For my final thesis, I conducted a 2x2x3 mixed ANOVA in SPSS, mixed meaning that the first factor was a...
  20. L

    Post-Hoc Analysis with a numerical factor

    Hello, I have a problem that required your help. I have some data that I would like to analysis. It is an experiment with two factors. The first one called "Condition" has three independent categorical levels. The second one called "Distance" is a continuous variable. The same subject...