Summary statistics for kneereplacementper1000medicareen variable in 2007_surg_d

    Variable |        Obs        Mean    Std. Dev.       Min        Max
-------------+---------------------------------------------------------
kneereplac~n |      2,893     2.36517    9.525062  -34.71383   19.37757

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