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fisher exact test

Chi-Square Test of Independence Rule of Thumb: n > 5

by Audrey Schnell  2 Comments

Ever hear this rule of thumb: “The Chi-Square test is invalid if we have fewer than 5 observations in a cell”.

I frequently hear this mis-understood and incorrect “rule.”

We all want rules of thumb even though we know they can be wrong, misleading, or misinterpreted.

Rules of Thumb are like Urban Myths or like a bad game of ‘Telephone’.  The actual message gets totally distorted over time.

[Read more…] about Chi-Square Test of Independence Rule of Thumb: n > 5

Tagged With: chi-square test, fisher exact test, rules of thumb, sample size, Yates correction

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Member Training: Seven Fundamental Tests for Categorical Data

by TAF Support 

In the world of statistical analyses, there are many tests and methods that for categorical data. Many become extremely complex, especially as the number of variables increases. But sometimes we need an analysis for only one or two categorical variables at a time. When that is the case, one of these seven fundamental tests may come in handy.

These tests apply to nominal data (categories with no order to them) and a few can apply to other types of data as well. They allow us to test for goodness of fit, independence, or homogeneity—and yes, we will discuss the difference! Whether these tests are new to you, or you need a good refresher, this training will help you understand how they work and when each is appropriate to use.

[Read more…] about Member Training: Seven Fundamental Tests for Categorical Data

Tagged With: categorical outcome, categorical variable, chi-square test, cochran-mantel-haenszel, fisher exact test, goodness of fit, independence, mcnemar test, Z test

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What Is an Exact Test?

by Karen Grace-Martin  2 Comments

Most of the p-values we calculate are based on an assumption that our test statistic meets some distribution. These distributions are generally a good way to calculate p-values as long as assumptions are met.

But it’s not the only way to calculate a p-value.

Rather than come up with a theoretical probability based on a distribution, exact tests calculate a p-value empirically.

The simplest (and most common) exact test is a Fisher’s exact for a 2×2 table.

Remember calculating empirical probabilities from your intro stats course? All those red and white balls in urns? [Read more…] about What Is an Exact Test?

Tagged With: empirical probability, fisher exact test, Fisher's, p-value

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