Separation Phenomena Logistic Regression

Barreto, Íkaro Daniel de Carvalho; Russo, Suzana Leitão; Brasil, Gutemberg Hespanha; Simon, Vitor Hugo

doi:10.7198/s2237-0722201400010024

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Cited by 4 publications

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“…Occasionally, odds ratios could not be calculated due to the presence of null crossings between variables (separation problems). 19 The project was approved by the Ethics Committee for Research involving human beings at the Universidade Federal de Sergipe, CAAE: 22488213. 4…”

Section: Methodsmentioning

confidence: 99%

Practices and obstetric interventions in women from a state in the Northeast of Brazil

Prado

Mendes

Gurgel

et al. 2017

Rev. Assoc. Med. Bras.

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Section: Methodsmentioning

confidence: 99%

Practices and obstetric interventions in women from a state in the Northeast of Brazil

Prado

Mendes

Gurgel

et al. 2017

Rev. Assoc. Med. Bras.

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Hypothesis Tests under Separation

Rainey

2023

Polit. Anal.

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Separation commonly occurs in political science, usually when a binary explanatory variable perfectly predicts a binary outcome. In these situations, methodologists often recommend penalized maximum likelihood or Bayesian estimation. But researchers might struggle to identify an appropriate penalty or prior distribution. Fortunately, I show that researchers can easily test hypotheses about the model coefficients with standard frequentist tools. While the popular Wald test produces misleading (even nonsensical) p-values under separation, I show that likelihood ratio tests and score tests behave in the usual manner. Therefore, researchers can produce meaningful p-values with standard frequentist tools under separation without the use of penalties or prior information.

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The Impact of Predictor Variable(s) with Skewed Cell Probabilities on Wald Tests in Binary Logistic Regression

Alkhalaf

Zumbo

2017

J. Mod. App. Stat. Meth.

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A series of simulation studies are reported that investigated the impact of a skewed predictor(s) on the Type I error rate and power of the Wald test in a logistic regression model. Five simulations were conducted for three different regression models. A detailed description of the impact of skewed cell predictor probabilities and sample size provide guidelines for practitioners wherein to expect the greatest problems.

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Separation Phenomena Logistic Regression

Cited by 4 publications

References 0 publications

Practices and obstetric interventions in women from a state in the Northeast of Brazil

Practices and obstetric interventions in women from a state in the Northeast of Brazil

Hypothesis Tests under Separation

The Impact of Predictor Variable(s) with Skewed Cell Probabilities on Wald Tests in Binary Logistic Regression

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