Frequencies for first 10,000 rows of prov5540 variable in pos1996 dataset :

  number of |
   patients |
   tue. 4th |
      shift |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,997       99.97       99.97
          5 |          1        0.01       99.98
          8 |          1        0.01       99.99
         13 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 26 Jan 2016