UIPL 18-90 Attachment 2

INSTRUCTIONS FOR CHOOSING SAMPLE

Determine the Skip Interval. Divide the number of cases in the sampling frame of delayed cases (N) by the sample size (n) and round to the nearest integer to obtain. the skip interval (k).

Examples:

k = 60 / 30 = 2

k = 77 / 30 = 2.56, round to 3

k = 94 / 30 = 3.13, round to 3

Determine the Random Start Number. The table below contains a number for each SESA. Use this to select the random start number for the first case by multiplying the SESA's number by the number of cases in the sampling frame and.rounding to the nearest integer.

AL .987 IL .596 MT .509 PR .238 AK .576 IN .758 NE .630 RI .226 AZ .283 IA .191 NV .560 SC .980 AR .682 KS .350 NH .101 SD .997 CA .685 KY .390 NJ .430 TN .397 CO .954 LA .924 NM .551 TX .507 CT .629 ME .988 NY .789 UT .765 DE .167 MD .445 NC .796 VT .328 DC .042 MA .316 ND .570 VA .981 FL .284 MI .791 OH .044 WA .927 GA .604 MN .353 OK .064 WV .758 HI .178 MS .651 OR .086 WI .465 ID .810 MO .083 PA .892 WY .577 Identify Remaining Cases. Select every kth case following the first selection (r), where k is the skip interval, until n (30) cases have been chosen. If the end of the sampling frame is reached before n cases have been selected, return to the beginning of the frame and continue the systematic selection.