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Cited by 1,290Statistical Methods in EpidemiologyStatistical Methods and ApplicationsStatistical Methods and Bayesian Inference

The DOI matches its Crossref record; 25 of the 25 references it cites were found in a registry or an index.

Logistic Regression: A Brief Primer

Stoltzfus, Jill C.·2011·Academic Emergency Medicine
DOI 10.1111/j.1553-2712.2011.01185.x
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Abstract

Academic Emergency Medicine 2011; 18:1099–1104 © 2011 by the Society for Academic Emergency Medicine Regression techniques are versatile in their application to medical research because they can measure associations, predict outcomes, and control for confounding variable effects. As one such technique, logistic regression is an efficient and powerful way to analyze the effect of a group of independent variables on a binary outcome by quantifying each independent variable’s unique contribution. Using components of linear regression reflected in the logit scale, logistic regression iteratively identifies the strongest linear combination of variables with the greatest probability of detecting the observed outcome. Important considerations when conducting logistic regression include selecting independent variables, ensuring that relevant assumptions are met, and choosing an appropriate model building strategy. For independent variable selection, one should be guided by such factors as accepted theory, previous empirical investigations, clinical considerations, and univariate statistical analyses, with acknowledgement of potential confounding variables that should be accounted for. Basic assumptions that must be met for logistic regression include independence of errors, linearity in the logit for continuous variables, absence of multicollinearity, and lack of strongly influential outliers. Additionally, there should be an adequate number of events per independent variable to avoid an overfit model, with commonly recommended minimum “rules of thumb” ranging from 10 to 20 events per covariate. Regarding model building strategies, the three general types are direct/standard, sequential/hierarchical, and stepwise/statistical, with each having a different emphasis and purpose. Before reaching definitive conclusions from the results of any of these methods, one should formally quantify the model’s internal validity (i.e., replicability within the same data set) and external validity (i.e., generalizability beyond the current sample). The resulting logistic regression model’s overall fit to the sample data is assessed using various goodness‐of‐fit measures, with better fit characterized by a smaller difference between observed and model‐predicted values. Use of diagnostic statistics is also recommended to further assess the adequacy of the model. Finally, results for independent variables are typically reported as odds ratios (ORs) with 95% confidence intervals (CIs).

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Metadata

Authors
Stoltzfus, J. C.
Affiliations
St. Luke's University Health Network (US)
Corresponding author
Stoltzfus, Jill C.
Venue
Academic Emergency Medicine
Publisher
Wiley
Published
2011-10
Volume
18
Issue
10
Pages
1099-1104
ISSN
  • 1069-6563 (ISSN-L)
  • 1553-2712
DOI
10.1111/j.1553-2712.2011.01185.x
OpenAlex
W1723129825
Cited by
1,290
References
24
Citations by year
2026: 128 · 2025: 231 · 2024: 256 · 2023: 182 · 2022: 149 · 2021: 114 · 2020: 58 · 2019: 50 · 2018: 27 · 2017: 26 · 2016: 29 · 2015: 18 · 2014: 13 · 2013: 6 · 2012: 3
FWCI
6.17
Type
journal article
Language
en
Open access
closed
Licence
onlinelibrary.wiley.com/termsAndConditions#vor (vor, 12 d)
Locations
  • Academic Emergency Medicine (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Physical Sciences › Mathematics › Statistics and Probability › Statistical Methods in Epidemiology
  • Physical Sciences › Mathematics › Statistics and Probability › Statistical Methods and Applications
  • Physical Sciences › Mathematics › Statistics and Probability › Statistical Methods and Bayesian Inference
Keywords
logistic regression, binary outcomes, confounding, feature selection, multicollinearity, model building strategy, goodness of fit, diagnostic statistics, odds ratio, internal and external validity
MeSH terms
Emergency Medicine, Humans, Research Design, Models, Statistical, Logistic Models, Biomedical Research

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