# non-parametric

1. ### Non-parametric Two-way ANOVA

Hi Guys, I wanted to run a TWO-way ANOVA but unfortunately, my variables are non-parametric. I have tried transforming the data but that did not work. I was wondering what the next step was? I was thinking of conducting two separate tests, a Friedman's test as a non-parametric alternative to...
2. ### How to correct for comparisons between and within groups?

I have two groups - control and treatment - and I'm following response for both groups at 4 timepoints. Data is not normally distributed and I am interested in timepoints where there is a significant difference. To check whether treatment has effect I look at: - whether response to treatment at...
3. ### Which non-parametric(?) test? 2 groups, 4 dependent v, 2 control v

Dear all, I would like to compare two groups (treatment: yes/no) at one point of time (end of the program) on four dependent variables (of which two seem to correlate with each other). Additionally, I have two control variables (which I suppose moderate the effect of treatment). I have roughly...
4. ### Comparing one normal and one skewed group

Dear Forum, I have 2 groups for which I need to compare the length of stay (LOS) post-op: a control and a treatment group. My control group has the following descriptive stats: (n=66; Mean = 8.42; Median = 6.00; SD = 7.45; Kurtosis = 17.66; Skewness = 3.81), while my treatment group is as...
5. ### Which non-parametric test to choose?

Hello everyone, I have trouble figuring out which statistical test for differences between two groups to choose from: I have two groups, A and B. For each group member I measured a value X and shortly after a value Y. These values depend on each other. I calculated the difference between value...
6. ### Which non-parametric test should I use while running GLM?

I'm trying to analyze some experimental data about animal behaviour using R and would need some help or advice regarding which non-parametric test should I use. The variables I have are: - Response variable: "Vueltasmin", a numeric one - Explicatory variable: "Condicion", a factor with 6 levels...
7. ### Non-parametric tests for repeated measures data

Hi, I'm having difficulty finding an appropriate test for my data. The experiment is looking at the distance animals have moved from a translocation site over a 12 week period (measured weekly), where animals are divided into 3 treatments (ie. I am looking at whether the different...
8. ### MANOVA: What to do with a u-shaped DV?

Hi, I am hoping to get some advice on my analysis for my MSc dissertation. I will try to keep it short but please let me know if there is more information I can provide to make the situation clearer. I have five conditions (IV): control, four experimental conditions. The experimental...
9. ### ANOVA or Chi Square for Nominal Non Parametric Data

Dear TalkStat Forum members, I was hoping to get some advice over whether I am using the appropriate test for data that I have. The notes of 70 patients were analysed and 2 variables (documentation of postive symptoms yes/no and negative symptoms yes/no) were noted on 4 occasions. An...
10. ### Non-parametric repeated measures guidance needed

What I am studdying is Aspergillosis (a disease) -it is caused by the terrestrial soil fungus called Aspergillus sydowii - of the sea fan Gorgonia ventalina. What I know so far: 1) My data is non-parametric....Residuals are not normally distributed and transformations do not help. 2)...
11. ### Newbie needs help: my research sample is one end of the bell curve only

Hello forum members I did the wonderful Princeton Statistics 1 Coursera MOOC which I really enjoyed. But I have hit a problem with a project which I can't find answers to in my course notes as this introductory course only briefly covered non-parametric statistics. I have a normally...
12. ### Normal and non-parametric repeated test data

Hi All I have done some experimental work and collected data for the conductivity of water with various concentrations of salt. The experiment collected data every 15 mins for 24 hours. Some of the data produced is Normal and other data sets are not normal. Hence I don't know what stats I...
13. ### non-parametric data for reference ranges

Hello, I am very new to statistical analysis, but am very excited to to be learning it. I am working on finding reference ranges for some mammalian blood work. I hope this is the appropriate place to post my query, otherwise, my apologies. I have successfully found my reference ranges...
14. ### How to analyze parents' talk when codes are not normal in a mixed design?

This is a but tricky to explain, so I will do my best. I am trying to analyze coded talk by parents for three different categories of objects. I coded parents labeling of the three different types of objects either as standard labeling, uncertain labeling or labeling of an absent object. The...
15. ### When is data 'nearly normal' - enough to break parametric rules

Hi everyone, I am a student who has carried out a renewable energy experiment for a dissertation project. My dependent variable is total biogas production. I designed an experiment to hopefully look at the influences on biogas production of pre-treatment (Yes or No), Enzyme (Yes or No) and...
16. ### Detecting outliers non parametric data

Hi, what is the best (and easy) way to detect outliers in spss for skewed, not exactly normally distributed data? I mainly need it for logistic regression an I assume that even tho logistic r. does not assume normality I still need to make sure that there are no extreme outliers Thanks a lot
17. ### Variation of Mantel test?

Hello. I am new to this forum but it looks like it will be a great reference! For my thesis I used Mantel tests to compare non-parametric behavioral data against genetic relatedness data. So, I had behavior rates in a square matrix and compared them against genetic relatedness values in a...
18. ### Kruskal-Wallis, assumption of non-homogeneity

Hello there, I am trying to do a Kruskal-Wallis test, but I am finding that some of my data sets do not satisfy the assumption of homogeneity of variances. What am I supposed to do in this situation? Let me provide some background on my analysis. I am looking at changes in shipping...
19. ### Fisher's exact test and non-inferiority / equivalence

I have some data (multiple choice question scores for two groups of medical students exposed to an experimental and standard type of anatomy teaching). It's ordinal data (scores out of 10). I'd like to test whether the experimental type of teaching is equivalent (i.e. not inferior) to the...
20. ### If In doubt - which test is best? Para/non Para

Hi, Which test is best to use with a small sample size? Parametric or non-parametric? (with even distribution), I've got a repeated measures design - does this reduce the limitations of the small numbers in any way? Not sure what is best to use. Also - what should I set my p value at 0.05...