Category Archives: FAQ

What are Z-Values in Logistic Regression?

Very Short Answer The z-value is the regression coefficient divided by its standard error. It is also sometimes called the z-statistic. It is usually given in the third column of the logistic regression regression coefficient table output. Thus, in the … Continue reading
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What is the Odds Ratio in Logistic Regression?

Most logistic regression software outputs (or can be asked to output) odds ratios along with the regression coefficients. These odds ratios are the exponential of the corresponding regression coefficient:     For example, if the logistic regression coefficient is the … Continue reading

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What is the (Multivariate) Logistic Regression Equation?

In logistic regression, the log odds is modeled as a linear functions of the -variables. Thus, the logistic regression equation is:     Once the logistic regression has been “run,” the software will calculate estimates for , , , … … Continue reading

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What is Ordinal Logistic Regression?

Ordinal Logistic Regression is logistic regression using an ordinal variable. An ordinal variable is a categorical variable where order matters. A variable that takes on the values of “very bad,” “bad,” “mediocre,” “good,” “very good” would be an example. The … Continue reading

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What is Nominal Logistic Regression?

Nominal Logistic Regression is logistic regression using a nominal variable as the dependent Y variable. The “nom” in “nominal’ comes from the Latin for “name” (not “number”) like in the word “nomenclature.” So a nominal variable is a variable whose … Continue reading

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