Summary statistics for partdpremiumobligationwith50prem variable in planreport2008 dataset :

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
partdp~0prem |    410,423    19.08131    42.51817          0       1233

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