Frequencies for first 10,000 rows of prov6155 variable in pos2008 dataset :

       srv: |
  ambulance |
    (owned) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,655       86.55       86.55
          0 |      1,266       12.66       99.21
          1 |         25        0.25       99.46
          2 |         50        0.50       99.96
          3 |          4        0.04      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 17 May 2017