;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;;; ;;; US draft lottery data for 1970 (Vietnam war). ;;; Selected December 1, 1969. ;;; Source: http://www.sss.gov/lotter1.htm ;;; Compiled by: R.W. Oldford, 2005 ;;; ;;; Rows are months Jan-Dec and columns are #days ;;; in that month which fall into each of three ;;; draft risk categories High, Medium, and Low. ;;; ;;; The lottery would assign each day of the year a ;;; unique number at random (supposedly) without replacement ;;; from 1 through 366. ;;; Young men who were eligible for that draft thus had ;;; a number associated with the day of their birth. ;;; Men were drafted in the order of the numbers associated ;;; (by lottery) with their birthday. ;;; Those at highest risk of being drafted would have had ;;; a low lottery number, those at lowest risk a high lottery number. ;;; ;;; The lottery numbers are divided into three categories ;;; of risk -- High, Medium, and Low -- ;;; each representing roughly one third of the days in a year. ;;; Those birthdays having the highest risk have lottery numbers ;;; 1-122, medium risk have numbers 123-244, and the lowest risk ;;; category contains lottery numbers 245-366. ;;; Highest numbers called up were: ;;; 1970 ... 195 ;;; 1971 ... 125 ;;; 1972 ... 95 ;;; 1973 ... no numbers called. ;;; ;;; If the lottery is fair, then the risk categories and the ;;; months of the year should be probabilistically independent. ;;; ... a straightforward chi-square test of independence indicates ;;; indicates evidence against independence. ;;; ;;; Variables are Month and Risk Month, Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec Risk, High, Medium, Low 9,12,10 7,12,10 5,10,16 8,8,14 9,7,15 11,7,12 12,7,12 13,7,11 10,15,5 9,15,7 12,12,6 17,10,4