Frequencies for first 10,000 rows of previs_rec variable in linkpe2009psden dataset :

  Number of |
   Prenatal |
     Visits |
 Recode U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        210        2.10        2.10
          2 |        136        1.36        3.46
          3 |        329        3.29        6.75
          4 |        696        6.96       13.71
          5 |      1,200       12.00       25.71
          6 |      2,336       23.36       49.07
          7 |      2,265       22.65       71.72
          8 |      1,331       13.31       85.03
          9 |        826        8.26       93.29
         10 |        268        2.68       95.97
         11 |        315        3.15       99.12
         12 |         88        0.88      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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