Frequencies for npi variable in rnl_rpt265_94_2011 dataset :

   national |
   provider |
 identifier |      Freq.     Percent        Cum.
------------+-----------------------------------
            |         19      100.00      100.00
------------+-----------------------------------
      Total |         19      100.00

by Jean Roth , jroth@nber.org , 17 Feb 2018