Summary statistics for pspp2012_30 dataset : by Jean Roth , jroth@nber.org , 12 Feb 2018 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- npi1 | 0 npi2 | 0 paircount | 54,966,715 147.6082 492.4633 11 269369 benecount | 54,966,715 41.56838 100.8133 11 193431 samedaycount | 54,966,715 18.12 137.5039 0 218354 -------------+--------------------------------------------------------- year | 54,966,715 2012 0 2012 2012 days | 54,966,715 30 0 30 30 begdate | 54,966,715 18993 0 18993 18993 enddate | 54,966,715 19390 0 19390 19390 by Jean Roth , jroth@nber.org , 12 Feb 2018