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

# ER EVENTS |
  ASSOC. W/ |
  CONDITION |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,453       94.53       94.53
          1 |        503        5.03       99.56
          2 |         29        0.29       99.85
          3 |          8        0.08       99.93
          4 |          6        0.06       99.99
          5 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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