Frequencies for first 10,000 rows of optmtrc_srvc_cd variable in pos2013 datase Services: | Optometric | Code | Freq. Percent Cum. ------------+----------------------------------- . | 8,601 86.01 86.01 0 | 1,230 12.30 98.31 1 | 81 0.81 99.12 2 | 71 0.71 99.83 3 | 17 0.17 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 26 Jan 2016