Summary statistics for pspp2012_90 dataset : by Jean Roth , jroth@nber.org , 12 Feb 2018 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- npi1 | 0 npi2 | 0 paircount | 91,175,470 230.5099 938.7927 11 712545 benecount | 91,175,470 42.73343 107.9595 11 193537 samedaycount | 91,175,470 12.95053 123.2343 0 268464 -------------+--------------------------------------------------------- year | 91,175,470 2012 0 2012 2012 days | 91,175,470 90 0 90 90 begdate | 91,175,470 18993 0 18993 18993 enddate | 91,175,470 19449 0 19449 19449 by Jean Roth , jroth@nber.org , 12 Feb 2018