Frequencies for npi variable in snf_rpt2540_96_2012 dataset :

   national |
   provider |
 identifier |      Freq.     Percent        Cum.
------------+-----------------------------------
            |          1      100.00      100.00
------------+-----------------------------------
      Total |          1      100.00

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