Frequencies for first 10,000 rows of whocomp variable in nhamcsopd1999 dataset :

who completed the patient record forms? |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                         Hospital staff |      4,289       42.89       42.89
Census Field Rep - Abstract during repo |        243        2.43       45.32
Census Field Rep - Abstract after rep p |      4,733       47.33       92.65
            Multiple categories checked |        589        5.89       98.54
                                Unknown |        146        1.46      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016