Summary statistics for partdpremiumobligationwith75prem variable in planreport2006 dataset :

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
partd~75prem |     25,055    12.47305    23.62929          0     620.27

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