Frequencies for first 10,000 rows of urf_renal variable in natl2003 dataset :

      Renal |
  disease U |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         15        0.15        0.15
          2 |      9,163       91.63       91.78
          8 |          7        0.07       91.85
          9 |        815        8.15      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Dec 2015