Summary statistics for partdpremiumobligationwith75prem variable in ma2013 dataset :

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
partd~75prem |     72,594    19.58223    63.04206          0     1165.3

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