Frequencies for first 10,000 rows of ob_srvc_desc variable in pos2013 dataset :

       Services: Obstetrics Description |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                                        |      8,601       86.01       86.01
                           NOT PROVIDED |        775        7.75       93.76
                      PROVIDED BY STAFF |        547        5.47       99.23
PROVIDED BY STAFF AND UNDER ARRANGEMENT |         37        0.37       99.60
             PROVIDED UNDER ARRANGEMENT |         40        0.40      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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