Frequencies for first 10,000 rows of nprevis variable in natlterr1998 dataset : Total | Number of | Prenatal | Visits | Freq. Percent Cum. ------------+----------------------------------- 0 | 105 1.05 1.05 1 | 24 0.24 1.29 2 | 63 0.63 1.92 3 | 126 1.26 3.18 4 | 213 2.13 5.31 5 | 310 3.10 8.41 6 | 518 5.18 13.59 7 | 671 6.71 20.30 8 | 815 8.15 28.45 9 | 707 7.07 35.52 10 | 1,953 19.53 55.05 11 | 594 5.94 60.99 12 | 1,739 17.39 78.38 13 | 460 4.60 82.98 14 | 526 5.26 88.24 15 | 575 5.75 93.99 16 | 210 2.10 96.09 17 | 101 1.01 97.10 18 | 117 1.17 98.27 19 | 32 0.32 98.59 20 | 69 0.69 99.28 21 | 14 0.14 99.42 22 | 14 0.14 99.56 23 | 6 0.06 99.62 24 | 4 0.04 99.66 25 | 8 0.08 99.74 26 | 3 0.03 99.77 27 | 1 0.01 99.78 29 | 1 0.01 99.79 30 | 1 0.01 99.80 34 | 1 0.01 99.81 36 | 1 0.01 99.82 37 | 1 0.01 99.83 38 | 2 0.02 99.85 39 | 3 0.03 99.88 43 | 1 0.01 99.89 49 | 1 0.01 99.90 99 | 10 0.10 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 22 Dec 2015