Summary statistics for machread2018 dataset : by Jean Roth , jroth@nber.org , 8 Dec 2017 Variable | Obs Mean Std. Dev. Min Max -------------+--------------------------------------------------------- state | 0 issuerid | 313 53763.53 26290.75 10046 99969 urlsubmitted | 0 techpocemail | 0 by Jean Roth , jroth@nber.org , 8 Dec 2017