Summary statistics for AGRMT_EXTNSN_PRIOR_DT variable in pos2011 dataset :

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
AGRMT_EXTN.. |      1,096    16282.93    2992.213      10470      19144

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