Frequencies for first 10,000 rows of whocomp variable in nhamcsopd2008 dataset :

who completed the patient record forms? |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                                  blank |        310        3.10        3.10
census field rep - abstract after rep p |      6,123       61.23       64.33
census field rep - abstract during rep  |         26        0.26       64.59
                         hospital staff |      2,850       28.50       93.09
            multiple categories checked |        691        6.91      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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