Frequencies for first 10,000 rows of services variable in namcs2010 dataset :

       were diag/screening/nonmed |
    treatment services ordered or |
                        provided? |      Freq.     Percent        Cum.
----------------------------------+-----------------------------------
        no services were reported |        250        2.50        2.50
at least one service was reported |      9,750       97.50      100.00
----------------------------------+-----------------------------------
                            Total |     10,000      100.00

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