Summary statistics for rpsr2005q4 dataset : by Jean Roth , jroth@nber.org , 18 Dec 2015 Variable | Obs Mean Std. Dev. Min Max -------------+-------------------------------------------------------- primaryid | 74548 4838460 28332.19 4711981 4929333 rpsr_cod | 0 by Jean Roth , jroth@nber.org , 18 Dec 2015