Frequencies for first 10,000 rows of prov3220 variable in pos1992 dataset :

  total 670 |
  hours for |
    prior 4 |
     survey |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |     10,000      100.00      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 17 May 2017