Frequencies for first 10,000 rows of u_apncu variable in natl2005 dataset :

Adequacy of |
   Prenatal |
       Care |
Utilization |
  Index RFP |
669=f_mpcb_ |
        u U |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |      1,482       14.82       14.82
          2 |      1,837       18.37       33.19
          3 |      3,685       36.85       70.04
          4 |      2,286       22.86       92.90
          9 |        710        7.10      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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