Frequencies for first 10,000 rows of prov4890 variable in pos2001 dataset :

 shared lab |
      cross |
reference # |      Freq.     Percent        Cum.
------------+-----------------------------------
            |     10,000      100.00      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 26 Jan 2016