# mann whitney u test

1. ### Mann-Whitney U Test test valid for percentage data?

Is the Mann-Whitney U Test test valid for percentages (there are no discrete counts underlying the percentage)? All my data points are average percent cover of seagrass with about 53% of the data being zeros across 8 group levels/columns (4 years x 2 seasons per year). I'd like to test the null...
2. ### Correction for multiple bayesian test (a lot of...)

Hello, I will start by saying that I am novice in Bayesian statistics, so I am really sorry if I mixed up some notion. I’m currently doing a research on the effect of heat on some bone microstructure. I want to test if there is any difference on the size of structure when exposed to heat. I have...
3. ### Association between non-normal continuous variable and dichotomous variable

Hello, I'm trying to examine the association between a non-normally distributed continuous variable and a dichotomous variable: yes/no. At first, I thought I should conduct point-biserial correlations but then I realised that in point-biserial correlations, the continuous variable needs to be...
4. ### Comparing one normal and one skewed group

Dear Forum, I have 2 groups for which I need to compare the length of stay (LOS) post-op: a control and a treatment group. My control group has the following descriptive stats: (n=66; Mean = 8.42; Median = 6.00; SD = 7.45; Kurtosis = 17.66; Skewness = 3.81), while my treatment group is as...
5. ### Is it appropriate to use Mann-Whitney U test for each of four outcomes when outcomes are mutually exclusive?

I have an experiment in which we randomize primate subjects into high condition (n=9) and low condition (n=8) groups, and document each subject's behavioral response to 15 consecutive food exposure trials. Each subject's behavioral response during every trial is classified into one of four...
6. ### My data does not follow a normal distribution, but Mann Whitney U test gives me a p-value of 0.935?

As the question indicates, I conducted a normality test on Minitab, and the p-value I received was 0.018, which is less than the significance level, therefore, it is not normally distributed. Therefore, I had to conduct a non-parametric Mann Whitney U test, and the p-value is 0.935, which...
7. ### Test wanted for comparing algorithms

Study design Suppose I want to compare algorithm runtime performance (measured in seconds) of different algorithms for the same problem type. There are several problem instances for this problem type on which the algorithms are tested and performance is measured. Possible tests As far as I...
8. ### Matt Whiteny U test Vs T test

Hello fellow statisticians, Problem definition: I need to test whether the difference between the "mean" utilization metrics of two machines is statistically significant. Given Data: Utilisation data is available for two machines for more than 100 days. Therefore, the mean, standard...
9. ### Comparing habitat use across two different locations - mann whitney U?

Hi, I'm really stuck with what test to use with my data. I have data on habitat use of 6 different habitat types across 2 locations and I'm unsure what test is most suitable. I thought initially mann whitney U but this doesn't seem to be working for me. I've attached the table below so you...
10. ### Mann Whitney U: can mean ranks be used along with medians in similarly shaped distrib

Dear TalkStatsers, I would be deeply grateful if you could help me with a simple question I have!!! From what I have read about Mann Whitney U, it is crucial for the reporting of the results to know whether your two distributions (i.e., the distribution of scores for both groups of the...
11. ### paired or unpaired?

Hi, Need some advice, if I'm comparing species abundance in the same location across two different seasons is this paired or non-paired for Mann-Whitney-U? Thanks in advance
12. ### Checking my approach - Mann whitney

Hi everyone I was wondering if I had used the correct approach to analyse my data. I have four groups of people answering a survey and taking part in several tests. I am analyzing their test scores looking for differences between the groups. I have used the mann whitney test. Is this OK? Also...
13. ### 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...
14. ### Paired or unpaired data and questions about test with >2 groups

Hi guys! I am here for some help with my statistics. I am currently working on a small project involving the expression of surface markers on cells in donated blood from different individuals. Basically, for each individual, I will keep a part of the blood untreated and apply two different...