Summary statistics for kneereplacementper1000medicareen variable in 1999_surg_d

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
kneereplac~n |         52    5.356989    1.301276   1.568254    8.47534

by Jean Roth , jroth@nber.org , 14 Mar 2018