Summary statistics for partdpremiumobligationwith75prem variable in planreport2013 dataset :

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
partd~75prem |    117,286    17.85147    58.39915          0     1223.7

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