To the Editor The Recurrence Risk Estimator has been put forward as a web-based prognostic score that integrates clinical and imaging information available in the acute setting to quantify early risk for recurrence of stroke.1 The validity of a prognostic score was examined in a multicenter study by Arsava et al,2 which aptly assessed the external validity and transferability of the Recurrence Risk Estimator. We would like to put forward the following fallacies we noted in this study.
Faisal SM, Kumar AS, Takkar A. Instrument for Predicting Early Stroke Recurrence: Ambiguity and Biases. JAMA Neurol. 2016;73(8):1030-1031. doi:10.1001/jamaneurol.2016.1724