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

  Pregnancy |
 Associated |
Hypertensio |
      n U;R |
(f_urf_phyp |
     er rep |
      flag) |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        246        2.46        2.46
          2 |      9,711       97.11       99.57
          9 |         43        0.43      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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