Frequencies for first 10,000 rows of apncu variable in natlterr2006 dataset :

Adequacy of |
   Prenatal |
       Care |
Utilization |
  Index RFP |
 668=f_mpcb |
          R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        516        5.16        5.16
          2 |        251        2.51        7.67
          3 |      1,172       11.72       19.39
          4 |      1,764       17.64       37.03
          9 |         22        0.22       37.25
          . |      6,275       62.75      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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