if you use a previously published logistic regression what should you use? how to perform an external validation of regression models can you perform an external validation of a regression model? how to do an external validation how to do external validation of logistic regression model how to perform an external validation of a logistic regression can you externally validate a logistic regression model how to verify previously published model m how to do regression external validation can an external validation be performed on a logistic regression model how to perform an external validation how to validate a regression model what validation does this formula perform? how to validate a logistic regression model can external validation work with previously published models can you validate previously published model in a regression model? what is a validated model used for how to perform external validation of logistic regression model how to perform external validation of data? what is validation formula