Frequencies for first 10,000 rows of auth variable in nhamcsopd1999 dataset :

        was |
authorizati |
on required |
  for care? |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,135       11.35       11.35
          2 |      6,038       60.38       71.73
          3 |      2,665       26.65       98.38
          4 |        162        1.62      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016