Frequencies for first 10,000 rows of auth variable in nhamcsopd1998 dataset :

        was |
authorizati |
on required |
  for care? |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,708       17.08       17.08
          2 |      6,518       65.18       82.26
          3 |      1,669       16.69       98.95
          4 |        105        1.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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