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A proportion is the fraction of some total that is of a particular kind, either (i) as a count of one type of thing out of a total count, or (ii) as a component of a continuous variable.

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Comparing 3 independent proportions (categorical)

Assuming the outcome is the proportion of correct individual answers to each of three independant questions or groups of questions without any ordering, one way to compute the sample size required to achieve … The first approach is to consider the variance of the proportions divided by the product of the average proportion times one minus the average. …
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What is the relationship between a chi squared test and test of equal proportions?

Very short answer: The chi-Squared test (chisq.test() in R) compares the observed frequencies in each category of a contingency table with the expected frequencies (computed as the product of the ma …
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