Frequencies for first 10,000 rows of ume_vac variable in natl2011 dataset :

 Vacuum RFP |
735=f_u_vac |
        U;R |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |        177        1.77        1.77
          2 |      9,041       90.41       92.18
          9 |        782        7.82      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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