Summary statistics for partdpremiumobligationwith50prem variable in ma2014 dataset :

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
partdp~0prem |     36,493    25.23484    65.74676          0     1027.6

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