Frequencies for first 10,000 rows of prov2710 variable in posclia2003 dataset :

   prov2710 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |          1        0.01        0.01
        001 |      1,655       16.55       16.56
         AZ |      1,196       11.96       28.52
        LAB |      7,147       71.47       99.99
         M2 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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