non parametric tests

  1. N

    Kruskal-Wallis output problem

    Hi everyone, I have some troubles understanding some result of my Kruskal-Wallis test: I want to compare a variable across these 3 independent groups, and since its distribution is not normal, I run a non-parametric test. The test tells me to reject the null hypothesis (p=.000). The mean rank...
  2. B

    Comparing groups that are not independent

    I work with survey data and am interested in comparing the responses of different racial/ethnic groups. So for example, do the responses of White, Asian, Black, and Latinx differ significantly on question #1 in my survey. Race/ethnicity, however, is a "select all that apply" question. So, the...
  3. P

    Interpreting regression coefficients from non parametric regression in R (Rfit)

    Hallo, I need to examine the relationship between an outcome variable (continuous) and a number of predictors. Since my data is non-normally distributed (i.e. the residuals from the multiple linear regression are not) I decided to use a rank-based regression using the Rfit function from the...
  4. S

    Stats analysis struggling

    Hi, I am conducting an experiment where I am assesing 4 groups undergoing 2 treatments. 3 groups have recieved same treatment and 1 group has recieved the other treatment. I have averaged values of the 3 groups. It is a pre and post experiment. I want to compare the data for both pre groups...
  5. S

    Stats analysis struggling

    Hi, I am conducting an experiment where I am assesing 4 groups undergoing 2 treatments. 3 groups have recieved same treatment and 1 group has recieved the other treatment. I have averaged values of the 3 groups. It is a pre and post experiment. I want to compare the data for both pre groups...
  6. S

    Statistical Analysis using Minitab

    Hi, I am conducting an experiment where I am assesing 4 groups undergoing 2 treatments. 3 groups have recieved same treatment and 1 group has recieved the other treatment. I have averaged values of the 3 groups. It is a pre and post experiment. I want to compare the data for both pre groups...
  7. K

    Wilcoxon Rank Sum Test Question

    2. Intermittent fasting (IF) consists of repetitive bouts of short-term fasting. It is of potential interest because it may provide a simple tool to improve insulin sensitivity in individuals with insulin resistance. (the latter increases the likelihood of type diabetes and heart disease). An...
  8. L

    Which tests to use in these examples? Wilcoxon etc.

    I'm pretty clueless, but would appreciate any help very much. I have: Group 1: went from nothing, to receiving surgery 1, and then later on received surgery 2. -> A (before), B (after first surgery), C (after second surgery) Group 2: went from nothing to receiving surgery 1 -> A...
  9. C

    Doing Parametric Tests without normal distribution

    Hello everyone! Is it true that when your sample is more than 30 people, you can do parametric tests, even though your sample may not follow the normal distribution? In my research I have 400 people as a sample, not following normal distribution and someone told me that I can do parametric...