Sample size calculations for clinical prediction model research (aka 'goodbye rules of thumb')

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References
DEVELOPMENT
Riley RD, Snell KI, Ensor J, et al. Minimum sample size for developing a multivariable prediction model: Part II - binary and time-to-event outcomes. Stat Med. 2019;38(7):1276-96.
Riley RD, Snell KIE, Ensor J, et al. Minimum sample size for developing a multivariable prediction model: Part I - Continuous outcomes. Stat Med. 2019;38(7):1262-75
Riley RD, Ensor J, et al. Calculating the sample size required for developing a clinical prediction model. BMJ 2020;368:m441.
Riley RD, Van Calster B, Collins GS. A note on estimating the Cox-Snell R(2) from a reported C statistic (AUROC) to inform sample size calculations for developing a prediction model with a binary outcome. Stat Med 2021;40(4):859-64.

VALIDATION
Riley R, Debray TP, Collins GS et al. Minimum sample size for external validation of a clinical prediction model with a binary outcome. Stat Med 2021;40:4230-4251
Archer L, Snell KIE, Ensor J, et al. 2020. Minimum sample size for external validation of a clinical prediction model with a continuous outcome. Stat Med 2021; 40: 133-146
Snell KIE, Archer L, Ensor J, et al. External validation of clinical prediction models: simulation-based sample size calculations were more reliable than rules-of-thumb. J Clin Epi 2021;135:79-89.