Frequencies for first 10,000 rows of ipnum variable in h170 dataset :

# INPATIENT |
     EVENTS |
  ASSOC. W/ |
  CONDITION |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,751       97.51       97.51
          1 |        217        2.17       99.68
          2 |         21        0.21       99.89
          3 |         11        0.11      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 14 Jul 2017