Frequencies for first 10,000 rows of auth variable in nhamcsopd1997 dataset :

        was |
authorizati |
on required |
  for care? |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,514       15.14       15.14
          2 |      6,324       63.24       78.38
          3 |      2,065       20.65       99.03
          4 |         97        0.97      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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