Frequencies for first 10,000 rows of auth variable in nhamcsopd2000 dataset :

        was |
authorizati |
on required |
  for care? |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,176       11.76       11.76
          2 |      5,291       52.91       64.67
          3 |      3,470       34.70       99.37
          4 |         63        0.63      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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