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

 Vacuum RFP |
735=f_u_vac |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        140        1.40        1.40
          2 |      8,403       84.03       85.43
          9 |      1,457       14.57      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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