Questions tagged [cochran-q]

Cochran's Q test is a nonparametric analog to the repeated measures ANOVA when the outcome is dichotomous/binary.

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Pick Top 3 - Cochran's Q?

I am trying to determine which statistical test to use. Participants were asked to choose the top 3 most important statements from a set of 15. I have read that Cochran's Q can be used to compare ...
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What should be the result of evaluating Cochran's q test when applied to k binary arrays of size n initialized randomly?

Experiment: I have five arrays (k=5) of 100 elements (n=100), with all elements set to 1. Then I use a random uniform distribution and zero out roughly half the elements in the five arrays. Now I run ...
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37 views

Meta-analysis: How to interpret a non-significant Q statistic but high I squared

I'm reviewing some meta-analyses on psychotherapies and trying to make sense of the statistics related to heterogeneity, specifically Cochran's Q and the I-squared value. I'm confused about how to ...
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Chi2 versus other tests for dependent samples (same observer different time)

I have come across a problem at deciding which hypothesis test I should use. I have personal previous research (great part of which is lost); of it, I have all the n and the proportions for each ...
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33 views

Cochran’s Q test for binary outcome and multilevel IV

I have two variables one is the dependent variable (Blood Type) with 2 levels and other is an independent variable with 11 levels as shown below ...
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235 views

Are there good alternatives to Cochran's Q test for heterogeneity in meta-analysis?

We used the Q test to determine heterogeneity with p-values <0.10. A highly recognised statistician commented that the Q test has low power and that it should not be used to determine presence of ...
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251 views

McNemar or Cochran's Q for evaluating multiclass classifiers?

full disclosure: I did a semi-cross post of this question due to low traffic. Once I get an answer on any of the two questions, I will link the answer back to the respective other. tl;dr For ...
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72 views

Is it worth doing (single-armed) meta analysis if the studies' heterogeneity is very large?

I'm currently trying to perform a single-armed meta analysis of immunotherapy on breast cancer, which I believe this meta analysis will be the first among its intervention and cancer subtype. The ...
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Cochran's Q test with changing proportions

for my thesis I am investigating the change in proportions of children in regular and special education. The information is obtained through an online questionnaire, and I have data for 4 consecutive ...
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1answer
235 views

Combining multiple contingency tables

I have images that are evaluated by different experts. Basically, each expert look at the same pictures and saying whether a feature in the image exists or not. We have some images from diseased and ...
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1answer
148 views

Is this Cochran's Q test worthy? - Unsure if my data is paired

I want to measure whether the binary responses (0 and 1 - disagree or agree) are different among four different statements - i.e. whether certain statements are significantly more likely to be agreed ...
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1answer
113 views

How to test for group differences in a 'select all that apply' question

I have a study where I'm looking at post-surgical limitations after shoulder surgery between two groups of baseball players. Patients were told to select all that apply among: Pain, Stiffness, ...
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1answer
520 views

Subgroups Cochran's Q test

I'm actually doing a meta-analysis to investigate the effect of an instructional method on learners' performance. I have calculated coehen's d and Hedges' g, the average global size, W (weight) for ...
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443 views

Can Cochran's Q test take a 3 level nominal variable as the response (instead of 2)?

I conducted a study using within-subjects (repeated measure) design for collecting nominal data. I have been reading a lot closet I get for a suitable test is Cochran's Q test since I have repeated ...
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52 views

Non-parametric Tests for this data?

I am studying unprofessional conduct. I have every case of misconduct over a 5-year period. I am curious if misconduct varies by education level. As you can see, misconduct is broken into 13 ...
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1answer
754 views

Multiple-Sample Cochran's Q Test

I have a data set that contains binomial samples within two conditions and several blocks, with a random, small number of samples for each condition-block combination. For example: ...
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2k views

Q-Test of Heterogeneity for only two effect sizes?

I am using the Q-Test of Heterogeneity to investigate if several effect sizes derived from two different studies are significantly different from each other. More precisely, I have, for every effect ...
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1answer
678 views

Test for homogeneity in meta-analysis with a large number of studies

So I am conducting some literature searches on behalf of someone. I stumbled across a meta-analysis which used 23 studies. It tested the homogeneity of the studies used, using what I think is a ...
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Calculating heterogeneity (Cochrane $Q$ and $I^2$ statistics) in random effects model

I want to ask whether I can calculate the Cochrane $Q$ and $I^2$ statistics in a random effect model. I collected some data from different areas and want to compare the prevalence of allergic ...
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1answer
3k views

Cochran's Q & McNemar tests together

I have binomial outcome data for three groups that I am analyzing with Cochran's Q test. As discussed at this site, Cochran. However, I have to repeat this seven different times because I am ...
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1answer
215 views

Appropriate homogeneity test for meta-analysis

I'm looking at measures from different studies (for a meta-analysis) and hoping to provide an aggregate effect size. I'm trying to identify hetero-/homo-geneity to determine whether I should use a ...
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2answers
2k views

Effect size of Cochran's Q

I have performed a Cochran's Q test for a within-subjects experimental design with 3 conditions and 36 participants with a dichotomous dependent variable. I found a (just) statistically significant ...