Summary statistics for partdpremiumobligationwith25prem variable in planreport2006 dataset :

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
partd~25prem |     25,055    20.72859    25.76343          0      635.4

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