non-parametric test

1. What stat test to perform on non-parametric nominal data between several groups

Hi everyone :wave: I hope this is the right forum for this thread. Anyways, I'll cut the chase: I need to assess statistical differences of nominal data from experiments between several treatment and control groups in female vs. male mice, over a period of several days (1 data set gathered...
2. A non-parametric test for nomimal data made up from two independent variables

I have been looking for a statistical test to run for some experimental data I have acquired. I have two groups (IV); Stress and Control mice. I have been looking at cell morphology. I performed a sholl analysis (which places concentric circles from the soma of the cell every 5 microns...
3. Multiple Comparisons across events with discrete probabilities?

Been stuck on this problem for a few days. I have calculated many distributions that are all non-parametric, but appear to have trended to be approximately normal. I think a helpful way to visualize what I've done is a matrix with 24 columns and 16 rows. Each cell has one of these distributions...
4. Error bars don't overlap but aren't significantly diff. - interpretations/reasons?

Hello all, I'm struggling to understand/interpret my graph and kruskal wallis test. Basically, I've created a bar graph which looks pretty good. There are 5 bars, each with error bars, and none of the error bars overlap. All of my 5 groups look significantly different. HOWEVER, when I do a...
5. Scale Issue - MANOVA vs Kruskall Wallis

Hello, In my dissertation, I asked people in the general population to complete a battery of team process measures based on an effective team (condition 1) or ineffective team (condition 2) that they had participated on. I asked each participant to describe the pattern of technology use...
6. Fligner and Pollicello's robust rank order test: critical values

Hello Statistics Forum, I am using Fligner and Pollicello's robust rank-order (RRO) test to detect differences in central tendency between two samples. The data comes from experimental economics simulations. I would greatly appreciate your help with two issues I am facing with the...
7. Non-Parametric Analyses. Report medians and 95% CI in graphs?

Okay so, I'm currently writing my thesis, and I have to do non-parametric tests. I know that I have to report the medians in text. However, I'm doing graphs. Just wanted to ask whether anyone knows if I report the 95% CI and the medians in the graphs? When i do this it looks super weird and...
8. Random effects model in stata - how sensitive to non parametric assumptions

Hi, I am using a random effects model to analyse a 4 point time series longitudinal data to compare the effects of an intervention and control, some of my independent variables are non-parametrically distributed - how sensitive is random effects model to this? can i use it or should i perform a...
9. Is non-parametric test necessary for independent Likert-type items?

Hi everyone I am having a difficulty in extending my survey analysis containing Likert-type item/questionnaires. I'll try my best to give a detailed overview of how my findings and analysis have been doing up to this point. The purpose of my survey is to determine the most important signage...
10. 2-Way Analysis when the DV is Bimodally Distribution

Hello, I conducted a study with a 2X2 between-participants design. The DV is continuous but is theoretically assumed to be distributed bimodally, which is also what I get in the current data (both the raw scores and the residuals aren't normally distributed). Does anybody know the proper way...
11. Distribution of a subset of the complete sample

Dear all, My question can be easily misunderstood, so please allow me to briefly explain the experimental conditions. I have measured a variable from 120 individuals in total, 60 of one genotype and 60 of another. The distribution of the complete sample of each of the two genotypes is...
12. Non-parametric Chi-square test outputs *different* when order is reversed?

Hello, I am a physics graduate student and am conducting research on physics learning and teaching. I surveyed n=63 students Likert scale 1 to 4 pre and post month-long intervention to determine whether treatment works. The following has put me into a wall. Question: Does it make a...
13. 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...
14. Comparison of the power of the tests: Parametric test versus Non-parametric test

How can one compare using a simple experimentation or simulation whether a parametric test (e.g. t-test) is more powerful than its non-parametric counterpart (Wilcoxon signed rank test)? I understand that statistical power is defined as the probability of rejecting the null hypothesis when it...
15. non-parametric statistical test to compare two classification methods performance

Hello Friends, I have two different classification methods and I want to determine which method is better. Sensitivity and false detection rate is computed on a set of data for both the methods. I want to use non-parametric statistical test to determine which method is better among the two...