Category Archives: Basic

How Big a Sample? How Many X-Variables?

In this article address how much data you need in order to run standard logistic regression analyses. As is the case in essentially all statistical analysis, the amount of data you need in logistic regression depends on the number of … Continue reading
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Understanding Logistic Regression Coefficient Output:
Part 5 — Assessing Uncertainty

This article discusses using the logistic regression coefficient table output to assess uncertainty. It is the last part of a 5-part series focused on understanding and interpreting the logistic regression coefficient table. Click here to see a brief summary of … Continue reading
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Understanding Logistic Regression Coefficient Output:
Part 4 — Making Predictions

This article discusses making predictions using logistic regression. It is part 4 of a five-part series focused on understanding and interpreting the logistic regression coefficient output table. Click here to see a brief summary of the focus of each of … Continue reading
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Understanding Logistic Regression Output:
Part 3 — Assessing the Effects of the X-Variables

In logistic regression, as in least-squares regression, you often want to try to assess the effects of the independent -variables on the dependent -variable. In logistic regression, however, things are somewhat more complicated than in least-squares regression as I explain … Continue reading
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Understanding Logistic Regression Output:
Part 2 — Which Variables Matter

This article discusses one of the most important uses of the coefficient table, determining which variables matter. It is the second part of a five-part series discussing the logistic regression output coefficient table and its uses. Click here to see … Continue reading
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Understanding Logistic Regression Output:
Part 1 — The Coefficient Table

As with least-squares linear regression, the most important part of the output of a logistic regression is the regression coefficient table. In this five-part series of articles, which parallels and references the five-part series reviewing the least-squares regression coefficient table, … Continue reading

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What a Multivariate Logistic Regression Data Set Looks Like: An Example

Just to be sure that you have a clear idea of what a data set that is appropriate for logistic regression analysis looks like, I am providing an example in this article. As I indicated in the previous article, a … Continue reading

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What is (Multivariate) Logistic Regression?

Note: If you want to jump directly to the “punch line” skipping all of my explanation and development (and making me feel unappreciated :() click here. Recall that in regular least squares regression we fit a line to the data. … Continue reading

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