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

    Services Provided: Physical Therapy |
                               Descript |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                                        |      5,924       59.24       59.24
                            COMBINATION |        296        2.96       62.20
                           NOT PROVIDED |        289        2.89       65.09
                           Not Provided |         76        0.76       65.85
                  PROVIDED BY EMPLOYEES |        105        1.05       66.90
     PROVIDED BY INDEPENDENT CONTRACTOR |         14        0.14       67.04
                      PROVIDED BY STAFF |      1,290       12.90       79.94
PROVIDED BY STAFF AND UNDER ARRANGEMENT |         67        0.67       80.61
             PROVIDED UNDER ARRANGEMENT |      1,345       13.45       94.06
                               Provided |        594        5.94      100.00
----------------------------------------+-----------------------------------
                                  Total |     10,000      100.00

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