sample size

Sample size for multinomial logistic regression

de Jong VMT, Eijkemans MJC, van Calster B et al. Sample size considerations and predictive performance of multinomial logistic prediction models. Stat Med. 2019 (Open Access).

"In most cases, the calibration and overall predictive performance of the multinomial prediction model is improved by using penalized maximum likelihood regression"

Sample size for logistic regression

van Smeden M, Moons KG, de Groot JA, Collins GS, Altman DG, Eijkemans MJ, and Reitsma JB. Sample size for binary logistic prediction models: Beyond events per variable criteria. Stat Methods Med Res 962280218784726, 2018.

The event per variable (EPV) criterion has limited value for calculating sample size.

Study size based on precision

Rothman KJ, Greenland S. Planning Study Size Based on Precision Rather than Power. Epidemiology. 2018

"Focusing on precision may help to avert some of the problems related to reliance on statistical hypothesis testing"