Frequencies for first 10,000 rows of prov6155 variable in pos2009 dataset :

       SRV: |
  AMBULANCE |
    (OWNED) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,638       86.38       86.38
          0 |      1,261       12.61       98.99
          1 |         24        0.24       99.23
          2 |         72        0.72       99.95
          3 |          5        0.05      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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