Frequencies for first 10,000 rows of prprvtr variable in namcs2004 dataset :

 percent of |
   pat care |
    revenue |
       from |
private ins |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      2,145       21.45       21.45
          2 |      3,783       37.83       59.28
          3 |      2,235       22.35       81.63
          4 |      1,246       12.46       94.09
          9 |        591        5.91      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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