non-parameteric

  1. J

    Two variables (Crime rate and CPTED audit rating)- which test to use?

    Hello, I am a college student currently finishing up my Master’s degree in Applied Geography. I am working on a research project/thesis. The project is focused on Crime Prevention Through Environmental Design, AKA CPTED. CPTED is a theory that certain characteristics of the built environment...
  2. P

    Calculating representative value for data

    Assume there are ten data with values a_1, a_2, ..., a_10 each with different non-symmetric errors. The problem confronting me in brief is, to combine the 10 results a_i and their associated non-symmetric errors according to some acceptable precept so as to determine the value of a and its...
  3. M

    P-value - Parametric Vs Non-parametric

    Greetings Is it possible to compare the p-values derived from non-parametric tests to parametric tests? For example, lets say dataset 1: Copper concentration in spoil is not normally distributed, so I have to use a non-parametric test on it and get a p-value. Dataset 2: copper concentration...
  4. M

    Post Hoc analysis for non-parametric analysis in Minitab: HELP

    Greetings I wish to be able to use post hoc analysis on my non-parametric analysis on my data. I am currently using Krustal Wallis (as I have 5 sets of data that I wish to compare). As this will only give me a p-value and a z-value which informs me if the data is significantly different or...
  5. A

    How to plot non-parametric data with multiple time points?

    Hello, I analyzed some physiologic data (blood electrolyte levels etc) which was fairly skewed, so I used Kruskal-Wallis to test for differences between groups. I originally plotted the mean and SD, but I learned that plotting the median is more suitable with skewed data. My question is...
  6. S

    Possible stats tests to use?

    Hi, After racking my brain not knowing what to do with my data I thought I'd give it a shot and post here, as I'm still unsure what I can do to test it. Movement count per 10 seconds and survival was measured in the same animals along entire lifespan at set time points, such that when...
  7. M

    Running non-parametric repeated measures analysis with split file on

    Okay so, I'm currently writing up my thesis, and I've got 2 between group variables and 3 within-group variables. I'm not doing a mixed design ANOVA because my data is non-normal (I'm all okay with doing non-parametric). What my main question is, is whether it is okay to run say a...
  8. B

    Different variables - most normally distributed, a couple are not - best test to use?

    Hello everyone So glad I've found this site and hope that someone will be able to point in the right direction! I am looking at how physical activity scores (mins per week) in children, change pre and post intervention - as part of this I want to see what the affect of parental involvement...
  9. T

    Parametric or non-parametric test?

    Hi there, thanks in advance for any help you can give. I need to perform a correlation test between a parametric data set and a non-parametric data set: should I use a parametric test (Pearson) or a non-parametric test (Spearman's rho)? I'll be performing the analysis on SPSS.
  10. L

    Repeated measures help! (Friedmans Test)

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  11. C

    Non-parametric test for trend suggestions needed

    Hello, I am conducting trend analysis on rainfall time series using the Mann-Kendall rank correlation coefficient (tau). I would like to also use another non-parametric test to increase the reliability of the results, but I am having trouble finding a suitable test. I don't have a dataset...
  12. K

    Two-way non-parametric test with interactions?

    Hi I am trying to find the non-parametric equivalent of a two-way ANOVA (3x4 design) which is capable of including interactions. From my reading in Zar 1984 "Biostatistical analysis" this is possible using a method put forth in Scheirer, Ray, and Hare (1976), however, according to other posts...
  13. R

    Test if subsample from a large population is over-represented by extreme values

    hi everyone, I want to do a statistical test for significance, but I'm having difficulty deciding which test is most suitable. I was hoping to get some help. My data: I have changes in gene expression after a pertubation, to be precise, a log2-fold change i.e. log2((expression after...
  14. M

    Non-parametric test

    Hello everyone, Context: I'm am working on a tool that validates predicted genes. At the moment I want to validate the length of the predicted genes with the following approach: for a certain predicted gene I search for similar genes (similar above a certain threshold) in public databases (I...
  15. M

    Independence test for multidimensional data sets

    Hi I had a 6 dimensional (non parametric independent variables) data set, each case representing day of my study period. I performed clustering analysis and categorized the days into four groups. Now I am looking for a statistical test which can establish whether the 4 clusters are...