Frequencies for first 10,000 rows of apncu variable in natlterr2005 dataset :

Adequacy of |
   Prenatal |
       Care |
Utilization |
  Index RFP |
 668=f_mpcb |
          R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        598        5.98        5.98
          2 |        349        3.49        9.47
          3 |      1,257       12.57       22.04
          4 |      1,518       15.18       37.22
          9 |         23        0.23       37.45
          . |      6,255       62.55      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Dec 2015