Summary statistics for VLDTN_SRVY_DT variable in pos2011 dataset :

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
VLDTN_SRVY~T |      2,704    13541.22    3558.691       4780      19005

by Jean Roth , jroth@nber.org , 19 Apr 2019