Summary statistics for partdpremiumobligationwith25prem variable in planreport2012 dataset :

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
partd~25prem |    156,934    26.94367    57.36384          0     1242.2

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