Frequencies for first 10,000 rows of prov0130 variable in pos1991 dataset :

clia - hosp |
  lab id #1 |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      9,994       99.94       99.94
 04L0000010 |          1        0.01       99.95
 06L0000026 |          1        0.01       99.96
 06L0000055 |          1        0.01       99.97
 06L0000066 |          1        0.01       99.98
 06L0000067 |          1        0.01       99.99
 06L0000072 |          1        0.01      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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