Summary statistics for partdpremiumobligationwith25prem variable in planreport2007 dataset :

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
partd~25prem |     49,206    21.12106    18.24722          0      131.8

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