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1answer
37 views

What is the appropriate test when dependent variable is ordinal binary and independent variable is continuous?

I am curious what is the most appropriate test to use when the outcome variable is an ordinal binary (test score of pass or fail) with a set of four unordered treatment conditions (A,B,C,D) as the ...
1
vote
3answers
1k views

Meaning of chi-squared in R Kruskal-Wallis test

I have a simple question to ask, I think it was not covered in other questions. I am running a Kruskal-Wallis test in R, using the function kruskal.test. The output gives me the p-value and a chi-...
3
votes
1answer
876 views

Why is the Kruskal Wallis test statistic approximately chi-square distributed?

According to Wikipedia, the Kruskal-Wallis test statistic H is approximately Chi Square distributed under the null hypothesis. However I can’t find any resources explaining why that’s the case. I’m ...
1
vote
0answers
16 views

Proper name for the variant of Haldane estimator for handling empty cell in a 2xn contingency table

I am using R and survey package to analyse a survey that several 2xn contingency tables need to be analysed using Chi square ...
1
vote
0answers
47 views

Choosing the right test for cell count data and categorical data

I have recorded data from a lot of cells viewed under a microscope, and am now stuck trying to do a useful analysis of it. I have two types of cells (genotype; WT and null), and I treated them with ...
2
votes
1answer
70 views

In medical statistics, when to use $\chi^2$ and when to use Kruskal-Wallis H?

I am conducting a retrospective analysis on the effect of three different treatment option (intervention treatment) on a special type of cancer, so I have three groups: 1, 2, and 3. In the baseline ...
0
votes
1answer
66 views

converting a chi-square with more than one degree of freedom into a pearsons r

I want to run a power analysis for a study using correlations between two continuous variables. Previous research with the variable I am interested in used a Kruskal-Wallis test to look at differences ...
0
votes
0answers
1k views

Chi-Square value in Kruskal Wallis test very large

I am comparing measurements of 12 different groups to one another. My distributions are not normal and my Levene's test is significant - even after data transformation. I am therefore doing a Kruskal-...
0
votes
1answer
262 views

Which test? Chi-square, non-parametric or Poisson Regression..? What species is the most frequently observed

I'm reposting my question based on previous comments received. The problem: 10 x 100m sections of shoreline have been sampled to determine if one species is the most frequently observed species (...
1
vote
0answers
20 views

What's the best way to demonstrate differences in these means/totals?

With some co-authors, I coded 200 video game reviews based on whether they mentioned any of nine different game elements. We now have the total number of times that each game element showed up in ...
2
votes
0answers
125 views

Is it okay to convert binary data to percentage data?

I have a within-groups study with 4 groups (400+ users). Each user answered 10 questions for each group. The answers were scored as right/wrong (1/0). Can the percentage correct for each user/group be ...
0
votes
1answer
2k views

Paired t-test, Kruskal-Wallis rank sum test and chisquare test. Which test should I choose?

I observed moth oviposition in orchard for 4 moths (400 clusters per week). The moth oviposit on leaf and apple. I want to compare the means between oviposit on leaf and apple. I suppose to use paired ...
2
votes
1answer
3k views

Is ETA a good measure for computing the efect size between an ordinal and a nominal variable?

I have a nominal and an ordinal variable and I would like to look measure the association that is between the two. For now, I have done Chi-square test and non-parametric Kruskall-Wallis Test and I ...
4
votes
1answer
4k views

Appropriateness of K-S test and Kruskal-Wallis for assessing medical data set

I am analyzing some stats for a paper I am writing. I have statistics help available through my faculty but am not there for a couple of months so hoping you can help out. n = 463, 2 patient groups( &...
9
votes
2answers
1k views

Benjamini-Hochberg dependency assumptions justified?

I have a data set where I test for significant differences between three populations with respect to some 50 different variables. I do this using Kruskal-Wallis tests, on one hand, and by likelihood ...