Summary statistics for partdpremiumobligationwith25prem variable in ma2013 dataset :

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
partd~25prem |     72,594    29.34583    64.95063          0     1183.8

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