Frequencies for first 10,000 rows of previs_rec variable in natlterr2007 dataset :

  Number of |
   Prenatal |
     Visits |
 Recode U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        363        3.63        3.63
          2 |        284        2.84        6.47
          3 |        449        4.49       10.96
          4 |        808        8.08       19.04
          5 |      1,123       11.23       30.27
          6 |      1,916       19.16       49.43
          7 |      1,579       15.79       65.22
          8 |        900        9.00       74.22
          9 |        495        4.95       79.17
         10 |        154        1.54       80.71
         11 |        215        2.15       82.86
         12 |      1,714       17.14      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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