Summary statistics for pspp2011_30 dataset : by Jean Roth , jroth@nber.org , 12 Feb 2018 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- npi1 | 0 npi2 | 0 paircount | 54,038,549 149.8551 495.6717 11 365685 benecount | 54,038,549 41.73082 95.31201 11 78410 samedaycount | 54,038,549 18.28102 129.8948 0 132554 -------------+--------------------------------------------------------- year | 54,038,549 2011 0 2011 2011 days | 54,038,549 30 0 30 30 begdate | 54,038,549 18628 0 18628 18628 enddate | 54,038,549 19024 0 19024 19024 by Jean Roth , jroth@nber.org , 12 Feb 2018