Frequencies for first 10,000 rows of uca_muscu variable in natl2005 dataset :

      Other |
Musculoskel |
       etal |
Anomalies U |      Freq.     Percent        Cum.
------------+-----------------------------------
          1 |         15        0.15        0.15
          2 |      9,845       98.45       98.60
          9 |        140        1.40      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 22 Dec 2015