Summary statistics for partdpremiumobligationwith25prem variable in planreport2011 dataset :

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
partd~25prem |    195,407    26.29339     55.2023          0     1242.2

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