# nonparametric

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2. ### How to change the alpha level in SPSS?

I have to do a Mann-Whitney U test in SPSS and it has to be alpha = 0.01, one-tailed. I know the default is 0.05, but I don't know how to change it to 0.01 in SPSS (for Mann-Whitney U test). Is it even possible?
3. ### Nonparametric data analysis

I'm asking for advice. Topic of my research is brain iron accumulation. My task is the next . I have one dependent variable that is cathegorical and binominal(patient has the pathology or does not). And six independent variables that are continuous and nonpatametric. The question is :how can i...
4. ### One way ANOVA vs Kruskal Wallis

Hi, I am comparing four groups (measurements of bone thickness and other bone parameters). The distributions are normal (Kolmogorov–Smirnov test) and variances equal between groups (Levenes test). I have 7 samples in each group. As I see from the literature this would call for a parametric...
5. ### Parametric vs. Nonparametric.

Suppose a researcher estimated a parameter in parametric way with correct distributional assumption. Another researcher estimated the same parameter in non-parametric way. Will there any difference of accuracy (bias) in estimation in these two situations?
6. ### Analysing Limited Data

Help! For my thesis I involuntary have a small dataset due to a limited population. I was thinking about analysing this data with the statistical model ANOVA, using non-parametric tests or Bayesian statistics. What do you think works best? Or are there any other methods/models/tests I can use...
7. ### Looking for appropriate non-parametric test for 5 dependent group & small sample size

What is the most appropriate parametric test for repeated observations for multiple dependent groups.
8. ### Question about parametric and nonparametric tests and non-probability sampling

I think I am pretty clear on the differences between parametric and nonparametric tests and which is more appropriate to use given the data you have collected. My question is about non-probability sampling and the use of the aforementioned tests. To my knowledge, both parametric and...
9. ### parametric or non-parametric in comparison of a dependent variable within several gro

down vote favorite I am comparing maths and chemistry scores of students in several schools. I am not comparing the schools with each other. I am just trying to say that students do better in maths than in chemistry in all of the schools studied. So I am comparing the maths and chemistry...
10. ### Bootstrap strange estimate

Hello everyone, I'm a statistical novice, I would like your help. I'm analyzing non-normally distributed variables. To develop the confidence interval I preferred to use non-parametric method: bootstrap. Unfortunately I get output biased estimates and standard errors high, even though I used a...
11. ### Nonparametric regression using kernel weights

Hi! I am wondering how I can present the results of nonparametric regression. I performed the nonparametric tests using R, and R package 'np'. The commands used for this are ) Using the last command, 'npsigtest', I get results like this How do I present this data in a scientific...
12. ### Reporting results of nonparametric regression

Hi! I am wondering how you present the results of non parametric regression test. I run the nonparametric regression using R, and the package np I get p- values but no df or t statistic. For example For the normal regression tests I did with other data, I presented the sample size, degrees...
13. ### How to do a post hoc analysis on non-parametric data in SAS

Good morning! I know there is a statistically significant difference between groups for my non-parametric data-set but I'm not sure how to find where those differences lie between groups.. I'm comparing race/ethnicity (Asian Pacific Islander, Hispanic, etc) by academic discipline (dental...
14. ### Non-para: "THE CONFIDENCE INTERVAL FOR MEDIAN BASED ON SIGN"

So my professor decided to write his own textbook, and we are finding errors everywhere, and it's difficult to understand, so I've tried google-ing and everywhere I go people are using different methods than the one he wants me to use here is an expample of what I am working with: 9. A...
15. ### one way anova or nonparametric?

in the attached file you can see the results from a viability test after normalization. Each column represents a different kind of treatment and in the last one are the controls (without any treatment). Each group has 12 replicates. Im trying to find the significant differences of each group...
16. ### similarity between two random variables

There have two random variables, each of which is of five dimension. One random variable tracks the data collected from one device. The other random variable represents the data collected from another device. I would like to see whether these two devices are replaceable with each other by...
17. ### Multivariate nonparametric comparison

I want to test whether two objects are similar or not. I have multivariate samples like this: Object1: X1, Y1, Z1, etc. Object2: X2, Y2, Z2, etc. Each letter is a variable, where same letter means same type of measurement. Variables do not follow a specific distribution (nonparametric)...
18. ### Nonparametric statistical significance test for largely skewed count data

My research design looks as follows: an experimental game with 4 participants (human subjects), repeated for 20 rounds. During each round, participants are allowed to form bilateral coalitions which cannot be dissolved until the end of a round. Hence, six different possible coalitions exist, but...
19. ### Nonparametric/Ranking Data Help!!

Hi all, I am a PHD student attempting to come to grips with an analysis of some recent data. I have a repeated measures design. 220 students were presented with 13 different problem scenarios and then had to indicate who they would seek help from, ranking a list of seven help providers (ie...
20. ### Constructing a Nonparametric confidence interval

The following data consist of six TcCB measurements from a particular site: 0.26 1.84 0.78 1.59 0.84 1.53 Use the table below to construct the shortest possible non parametric confidence interval for x 0.25 (25th percentile) assuming that the confidence level must be at least 80%. So, I...