Summary statistics for partdpremiumobligationwith50prem variable in planreport2007 dataset :

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
partdp~0prem |     49,206    17.36283    17.38838          0      131.8

by Jean Roth , jroth@nber.org , 14 Apr 2016