Frequencies for first 10,000 rows of prov2210 variable in pos1994 dataset :

       srv: |
 laboratory |
 (clinical) |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,940       89.40       89.40
          0 |          9        0.09       89.49
          1 |        787        7.87       97.36
          2 |        210        2.10       99.46
          3 |         54        0.54      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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