wilcoxon

  1. A

    High correlation but different median scores. How can this be possible?

    I am writing a research paper. We asked the same patients to fill out a form at two different times. Data is non-normal. I used Spearman's correlation, which gave me a moderate correlation between the two scores. I also used weighted kappa and this too gave me a moderate agreement between both...
  2. A

    Wilcoxon (SL) Regression - Confidence Intervals on Parameter Estimators?

    Does anyone know of a method to create confidence intervals on the SLR parameter estimates of a Wilcoxon Regression model?
  3. 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...
  4. C

    Survey on how frequently a group use a particular device: Which analysis methods?

    I surveyed a group of photographers and asked them how frequently they used a particular type of lens for a specific type of photograph. I now want to find out which lens or lenses are the most commonly used for each type of photograph. There were four lens types and five types of photographs...
  5. L

    [SPSS - wilcoxon/paired t test] - not normally distributed data

    Hello! I ran an analysis of my data of research into a repeated measures design and found the difference of both conditions to be not normally distributed. When exlcuding data to make it normally distributed and thus use parametric tests, can we only exclude data that exceeds the limit of...
  6. J

    non parametric multiple pairwise comparisons - which correction is allowed?

    Hello all, I have a data set from plant experiments with only 4 replicates. data are numbers of mites after different treatments. Because the datasets are small they are not normally distributed, so I use non parametric tests: Wilcoxon. First I did a pairwise comparison, without corrections...
  7. S

    Friedman ANOVA significant but post hoc tests not

    Hi, Would be very grateful if anyone could shed some light onto my stats. I have 3 different methods which i am testing on the same 4 users. My data is paired and normally distributed. My sample size is very small so I am using a Friedman's ANOVA (non-parametric test) to test for any...
  8. F

    Wilcoxon rank sum test with binary data

    Hello Everybody, Can the Wilcoxon rank sum test be used when the variable of interest is binary? For example, say I have a control group and a treatment group, and I am interested in seeing whether the treatment group goes to college more than the control group. The variable "college" takes...
  9. V

    statistics 101-statistical tests help!

    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...
  10. A

    How to run Wilcoxon Signed Rank Test of two groups in SPSS 18

    Hello, I would like to run Wilcoxon Signed Rank Test in SPSS 18 for the following data: There are 50 runners in the sample. I tested their pulse BEFORE the run. Some of the drank an energy drink from type 'A'. The rest drank an energy drink from type 'B'. I tested their pulse AFTER the...
  11. M

    comparing frequencies

    I have a survey question that asks which of 3 activities participants regularly participate in. They are told “select all that apply.” So they can mark any or all of the activities. As results, I get frequencies (# and %) for each activity. Now I want to compare the frequencies of the...
  12. M

    What method shoudl I inthose cell biovolume data

    Hello everyone! I am wiring a masters project involving counting algae and I am having a difficulty finding what is the right method to do the following comparisons on the biovolume data in this picture bellow: To test if there is a significant difference between the pairs Inlet 1-...
  13. K

    Wilcoxon Rank Sum Test vs Van de Waerden Test

    Hi, Would anyone be able to explain the difference between the Wilcoxon Rank Sum Test vs Van de Waerden Test? Do they look at or analyze the same thing? Can they be used interchangeably? Why would you use a Van de waerden test over a Wilcoxon rank sum test? What advantage or disadvantage does...
  14. I

    What tests should I use to analyze my data? Immediate input appreciated

    Hello TalkStats members :wave: I have some data I need to analyze. I first would like to say I hope I am posting this in the correct sub-forum, and I greatly appreciate any suggestions given. I have 116 "Case" patients, and 100 "Control" patients. Let's say, the "cases" have heart...