Frequencies for first 10,000 rows of clia_lab_classification_cd_10 variable in 

CLIA_LAB_CL |
ASSIFICATIO |
    N_CD_10 |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |      2,039       20.39       20.39
          5 |         12        0.12       20.51
          . |      7,949       79.49      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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