Frequencies for first 10,000 rows of limitunit variable in bencs2018 dataset :

                     Limit Unit |      Freq.     Percent        Cum.
--------------------------------+-----------------------------------
                                |      8,232       82.32       82.32
                  Days per Year |         94        0.94       83.26
           Dollars per Lifetime |         26        0.26       83.52
               Dollars per Year |         48        0.48       84.00
           Exam(s) per 6 Months |         56        0.56       84.56
               Exam(s) per Year |         94        0.94       85.50
                 Hours per Year |         44        0.44       85.94
              Item(s) per Month |        104        1.04       86.98
               Item(s) per Year |        138        1.38       88.36
            Months per Lifetime |         26        0.26       88.62
       Procedure(s) per 2 Years |          2        0.02       88.64
       Procedure(s) per 3 Years |         60        0.60       89.24
      Procedure(s) per 6 Months |          2        0.02       89.26
      Procedure(s) per Lifetime |          2        0.02       89.28
          Procedure(s) per Year |          2        0.02       89.30
     Treatment(s) per Procedure |          2        0.02       89.32
           Visit(s) per 2 Years |         12        0.12       89.44
          Visit(s) per 6 Months |         82        0.82       90.26
              Visit(s) per Year |        974        9.74      100.00
--------------------------------+-----------------------------------
                          Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 8 Dec 2017