Frequencies for first 10,000 rows of amb2 variable in nhamcsopd1992 dataset : Ambulatory | surgical | procedure | #2 | Freq. Percent Cum. ------------+----------------------------------- 0000 | 9,892 98.92 98.92 0820 | 1 0.01 98.93 0825 | 1 0.01 98.94 1341 | 1 0.01 98.95 1370 | 1 0.01 98.96 1371 | 26 0.26 99.22 1372 | 1 0.01 99.23 201- | 1 0.01 99.24 283- | 1 0.01 99.25 3142 | 1 0.01 99.26 3323 | 1 0.01 99.27 4282 | 1 0.01 99.28 4292 | 4 0.04 99.32 4414 | 2 0.02 99.34 4422 | 1 0.01 99.35 4513 | 1 0.01 99.36 4525 | 3 0.03 99.39 4542 | 4 0.04 99.43 4946 | 1 0.01 99.44 5300 | 3 0.03 99.47 539- | 1 0.01 99.48 5422 | 1 0.01 99.49 545- | 1 0.01 99.50 586- | 1 0.01 99.51 6561 | 3 0.03 99.54 6599 | 1 0.01 99.55 670- | 1 0.01 99.56 6712 | 9 0.09 99.65 6739 | 2 0.02 99.67 6812 | 2 0.02 99.69 6902 | 1 0.01 99.70 6909 | 2 0.02 99.72 7021 | 3 0.03 99.75 7033 | 1 0.01 99.76 7846 | 1 0.01 99.77 7869 | 1 0.01 99.78 806- | 2 0.02 99.80 8183 | 1 0.01 99.81 8221 | 2 0.02 99.83 8511 | 1 0.01 99.84 8521 | 1 0.01 99.85 8611 | 3 0.03 99.88 863- | 3 0.03 99.91 8659 | 2 0.02 99.93 9353 | 1 0.01 99.94 9354 | 4 0.04 99.98 9651 | 1 0.01 99.99 9999 | 1 0.01 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 28 Mar 2016