Frequencies for first 10,000 rows of dfpc_imp variable in natlterr2010 dataset : Day of Date | First | Prenatal | Care | Imputed R | Freq. Percent Cum. ------------+----------------------------------- 1 | 270 2.70 2.70 . | 9,730 97.30 100.00 ------------+----------------------------------- Total | 10,000 100.00 by Jean Roth , jroth@nber.org , 22 Dec 2015