Frequencies for first 10,000 rows of npi variable in psfltc dataset :

   National |
   Provider |
 Identifier |
      (NPI) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |     10,000      100.00      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 24 Sep 2018