Frequencies for first 10,000 rows of prov1150 variable in pos1991 dataset :

 registered |
    nurse - |
   contract |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      9,897       98.97       98.97
        .01 |          2        0.02       98.99
        .02 |          1        0.01       99.00
        .03 |          1        0.01       99.01
        .04 |          1        0.01       99.02
        .05 |          1        0.01       99.03
        .11 |          2        0.02       99.05
        .15 |          2        0.02       99.07
        .23 |          1        0.01       99.08
        .24 |          1        0.01       99.09
        .25 |         25        0.25       99.34
        .45 |          1        0.01       99.35
        .49 |          1        0.01       99.36
         .5 |         12        0.12       99.48
        .75 |          5        0.05       99.53
        .97 |          1        0.01       99.54
          1 |         17        0.17       99.71
       1.13 |          1        0.01       99.72
       1.25 |          7        0.07       99.79
        1.5 |          1        0.01       99.80
          2 |          5        0.05       99.85
       2.18 |          1        0.01       99.86
       2.25 |          1        0.01       99.87
       2.28 |          1        0.01       99.88
        2.5 |          2        0.02       99.90
       2.75 |          3        0.03       99.93
          3 |          1        0.01       99.94
        3.5 |          3        0.03       99.97
        3.8 |          1        0.01       99.98
          4 |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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