Frequencies for first 10,000 rows of prov2235 variable in pos1991 dataset :

       srv: |
   neonatal |
    nursery |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,770       87.70       87.70
          0 |        773        7.73       95.43
          1 |        408        4.08       99.51
          2 |         41        0.41       99.92
          3 |          8        0.08      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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