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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Generalized Cochran's Q Test

I have two groups of experimental data samples that are categorical, and my goal is similar to Pearson's chi-squared test (${ \chi ^{2}}$), to evaluate how likely it is that any observed difference ...
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is mcnemar's test suitable to evaluate the differences of the proportions of events between the subgroups of risk scores?

the authors indicated that comparing event frequencies of events between subgroups( example frs and df) of groups ( low intermediate high) mcnemar's test was used. is it right for this study design?
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Analyze Repeated Measures of a Frequency

I have the same group of participants (n=31,000) that answered the following question "What is your favorite subject?" by selecting one of three answer options (Science, Math, Art) at two ...
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calculate the change in standard deviation for metaanalysis

I am trying to calculate the change in standard deviation for my metaanalysis. I have the following data available: mean for control group at baseline and endpoint mean for intervention group at ...
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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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148 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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72 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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357 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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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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149 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
312 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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154 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
131 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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584 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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484 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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860 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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1answer
3k 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
689 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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1k views

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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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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229 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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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 ...