Frequencies for first 10,000 rows of prov2710 variable in posclia2005 dataset :

   prov2710 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |          1        0.01        0.01
        001 |      2,145       21.45       21.46
         AZ |      1,675       16.75       38.21
        LAB |      6,178       61.78       99.99
         M2 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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