Summary statistics for machread2017 dataset : by Jean Roth , jroth@nber.org , 28 Jun 2017 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- state | 0 issuerid | 311 53397.74 26235.86 10046 99969 urlsubmitted | 0 techpocemail | 0 by Jean Roth , jroth@nber.org , 28 Jun 2017