non-parametric

  1. M

    Testing if Rank Data varies significantly from 0

    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...
  2. I

    Need Complex Ordinal Analysis

    My question outlines the need for a non-parametric analysis of ratio data. I have a data set composed of apnea counts for individual mice during different breathing conditions and a drug. This boils down to a three factor ANOVA style data set Factor 1 -> Mouse Strain Factor 2 -> Gas...
  3. L

    Rank regression --> help!

    I am trying to do a multiple linear regression for a dependent variable Y,with different independent variables X1, X2, X3, etc. I need to use non-parametric multiple regression, as one of my IV, X1, is very skewed and transformation wouldn't help. I was suggested to use Rank regression...
  4. K

    behavioural economics experiment - non parametric repeated measures manova

    hi there, I wonder if sbdy could help me with my dissertation project. I am stuck with the analysis n tried to consult a few people but unfortunately they either have limited experience, knowledge or interest in the subject of statistics/behavioural economics. Basically, I got a mixed...
  5. A

    Statistical test for analyzing 2*3 between-subject design's main & interaction effect

    Hello, I am now having trouble analyzing my data since I got stuck on selecting the proper statistical test to use. My data is a 2*3 between-subject design data. The two IVs are one norminal(with values 0 and 1) and one ordinal(with values 0, 1,2), and my dependent variables are interval...
  6. A

    non-parametric ANCOVA?

    Dear all, I would appreciate any help on a much debated issue of non-parametric ANCOVA. I compare 2 gourps (group is a factor, categorical), y is post measure, and x is pre mesure (covariate). The question is if the effect of the treatement is the same on both groups. Are there...
  7. A

    non-parametric equivalence /non-inferiority test for ratio variable?

    Good day , I'm comparing subjects' success rates in two conditions A and B. All subjects run both conditions, so the data is paired. Each subject runs say 8 trials in both conditions, with 0 or 1 as output. The outcome for each subject is the ratio variable "success rate" (from 0.0; 0.125 ...
  8. Z

    Mann-Whitney U and Bonferroni Correction

    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...
  9. P

    How to compare a small sample to a large control group sample?

    Hello, The prupose of my research was to measure the impact of a dropout prevention program. I used a survey consisting mostly of Likert scales and I compared the answers to a control group. The control group was relatively large, as it was based on a government study of roughly 1500...
  10. G

    finding the impacts of independent variables to dependent variables

    Hi everyone. I am new in this forum and also new in statistic. My background is civil engineering. I've been looking for a solution for my question and found out that this forum is very helpful. I need to explore how my independent variables affect/impact the dependent variable, which one has...
  11. M

    non-parametric t-test with mean/SD = 0

    Hi All, quick question on non-parametric t-test I have 2 groups. 7 values each. Group One= 0, 0, 0, 0, 0, 0, 0 which of course is mean=0 and SEM=0 Group Two= 0, 0, 21, 35, 0, 0, 0 mean=8 and SEM=5.4 When I do unpaired non-parametric Mann-Whitney two-tail test, I am told that because...
  12. J

    Some help needed in analyzing Likert-type data (using Repeated Measures ANOVA?)

    First of all hello to everyone, since I'm new to this forums. I'm afraid statistics is not my strongpoint (to put it mildly), and thus apologize that I have to ask your help on what I fear is quite a 'beginner-level' type of question. Any help you can give me is greatly appreciated though...
  13. N

    Can you compare 3 small groups <4 participants using Multiple Mann-Witney?

    Hi, I am very new to statistics but have found myself doing a small master desgree research project with very little statistics background so I am finding it very difficult. I have had a go at a mann-whitney but am just not confident that it is the correct test to use or whether there is...
  14. 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...
  15. P

    Follow-up on Kruskal-Wallis

    Hi everybody! I just found this forum and became so happy because I'm in a bit of trouble and have no book to help me right now. I am doing an statistical analysis based on the answers from a survey a friend of mine created. The respondents are visitors to a music festival and the survey...
  16. O

    Parametric test results vs Non-parametric test results - interpretation help please?

    :wave: Hello, thank you so much for your help. I am currently working on an article about trends in streamflow in watersheds with different land use change over time. For this I need to analyze trends in streamflow parameters over time. Both non-parametric and parametric tests were applied...
  17. A

    Nonparametric multiple linear regression with SPSS

    Is there a way to conduct nonparametric multiple regression analysis using SPSS? If yes, can you provide some explanations on this regard. I have three IVs and one DV with nonparametric data from a Likert scale. I trying to identify if I can use the IVs to predict the DV. Also, I want to...
  18. A

    Autocorrelation and comparing means......

    Hi All, I might be totally missing a key point here - or making a mountain out of a molehill, but I have been reading around and trying to find the answer to this question for a day or so now, so figured I might as well ask! I have counts of birds per hour in a effort-based monitoring survey...
  19. C

    Using variations of ANCOVA for non-normal distributions

    My first question here, hope to be relevant to the community. Im into CS course and a total rookie on statistics, so let me know if more detail is needed and I will edit the post. I have a problem now that we want to compare sample groups and wanted to come up with a function out of it, so we...
  20. K

    Ranked Data Newbie - please help!

    Hi, I recently ran several focus groups where particpants were asked to rank a series of 18 photos from most natural to most unnatural. I then gav each photo a score from 1-18 (1 being most natural and 18 most unnatural). The data looks likes this: photo 1a 1b 2 3 1 1 1 1 1 2 7 8 10.5 2 3...