Summary statistics for partdpremiumobligationwith50prem variable in planreport2006 dataset :

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
partdp~0prem |     25,055    16.59922    24.52106          0     627.83

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