Summary statistics for ndchcpcsopps dataset : by Jean Roth , jroth@nber.org , 5 Feb 2018 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- hcpcs | 0 shortdescr~r | 0 labelername | 0 ndc | 0 ndcdash | 0 -------------+--------------------------------------------------------- drugname | 0 hcpcsdosage | 0 pkgsize | 559 64.52442 160.7616 .05 1000 pkgqty | 559 1.853309 2.900986 1 25 billunits | 559 161.1352 326.4473 .1 2000 -------------+--------------------------------------------------------- billunitspkg | 559 179.3937 363.9646 .1 2660 fileyear | 560 2011.548 3.061299 2007 2018 filemonth | 560 6.041071 3.441839 1 10 notes | 0 by Jean Roth , jroth@nber.org , 5 Feb 2018