Frequencies for first 10,000 rows of pastvis variable in nhamcsed2011 dataset :

   How many |
  times has |
    patient |
  been seen |
 in this ED |
 within the |
    last 12 |
    months? |      Freq.     Percent        Cum.
------------+-----------------------------------
      Blank |        159        1.59        1.59
    Unknown |      2,831       28.31       29.90
          0 |      3,256       32.56       62.46
          1 |      1,586       15.86       78.32
          2 |        814        8.14       86.46
          3 |        438        4.38       90.84
          4 |        300        3.00       93.84
          5 |        161        1.61       95.45
          6 |        105        1.05       96.50
          7 |         74        0.74       97.24
          8 |         69        0.69       97.93
          9 |         44        0.44       98.37
         10 |         29        0.29       98.66
         11 |         20        0.20       98.86
         12 |         25        0.25       99.11
         13 |          9        0.09       99.20
         14 |         10        0.10       99.30
         15 |          8        0.08       99.38
         16 |          7        0.07       99.45
         17 |          4        0.04       99.49
         18 |          4        0.04       99.53
         19 |          4        0.04       99.57
         20 |          5        0.05       99.62
         21 |          5        0.05       99.67
 23 or more |         33        0.33      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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