mann-whitney u

My goal is to analyze the impact certain programming language features have on a set of metrics. In my dataset, I have a set of metrics for each code block. For a comparison, I classified the code blocks into two groups. One group uses a specific programming language feature and the other does...

Hello, can someone tell me how to compute the p-value in a rank-biserial correlation? I understand the rank-biserial correlation coefficient is a function of the Mann–Whitney U test, and is a special case of Somers' d where one variable is dichotomous and the other is ordinal or continuous, but...

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...

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...

Hi, I've done a survey with an 11 point Likert scale (-5 to +5, with 0).There are 30 questions total in the survey, with ~800 responses. I have graphed the median response for each survey question, but I am looking for a way to test which questions are 'significantly' different from 0 (a...

Hi, I just don’t know how to go on with my research at the moment, I haven’t found answers to my questions in any forums or papers, so it would be really great if someone here could help me with that: I have 2 samples, which I got by conducting a 5-point Likert scale survey. I have 9...

Hi. I'm really sorry if this question is in the wrong place. I'm trying to figure out and justify statistical tests to be used for a research proposal - don't have to do the tests just explain and justify my selection. I am comparing 2 groups. group a has 1 days training and group b has 5...

I have 2 data sets, each N=10, that I would like to compare. They fail Levene's test for homogeneity of variances, and for this reason, I can't use the t-test. I believe that the Mann-Whitney-Wilcoxon nonparametric test is my proper alternative. Here are the data: X1 = [90.4 96.0 94.8 90.4...

Good Afternoon all, I am using a Mann Whitney U to compare two populations the data ranges from (-2 to 2). I have already done this on 4 different variables however for one of them I have repeatedly got a p=value of 0.0000 (Using mini-tab). C2 461 2.0000 C1 503 1.0000 Point...

Hi there, I am a total beginner with SPSS and I really need your advice, because I am carrying out my research. Is it possible to use Mann-Whitney test on a Likert scale when a question consists of 20 statements (a respondent has to choose how strongly he agrees or disagrees with every...

I recently presented some work in my department in which my colleagues and I had applied a Mann-Whitney U test for multiple pairwise comparisons. We used a Bonferroni-adjusted alpha for the test. After my presentation, a guy generally considered to be a statistics whiz told me that the...