Frequencies for first 10,000 rows of ob_srvc_desc variable in pos2012 dataset :

          Services Provided: Obstetrics |
                            Description |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                                        |      8,606       86.06       86.06
                           NOT PROVIDED |        774        7.74       93.80
                      PROVIDED BY STAFF |        555        5.55       99.35
PROVIDED BY STAFF AND UNDER ARRANGEMENT |         28        0.28       99.63
             PROVIDED UNDER ARRANGEMENT |         37        0.37      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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