In the following example, the researcher was interested in determining if the following index (x) was associated with (y), remission in cancer patients. The indexxmeasures proliferation activity of cells after a patient receives an injection oftritiated thymidine. The response variableyindicates whether the patient achieved remission (1), or did not achieve remission (0).

1 15 2 9 3 37 4 31 5 31 6 40 7 11 8 2 9 27 10 30 11 40 12 25

13 4 14 24 15 38 16 20 17 26 18 34 19 22 20 35 21 24 22 25 23 8 24 20 25 4

The data is tabulated below:

x

ycasex

0 26 27 0 27 23 1 28 23 1 29 15 1 30 1 1 31 39 0 32 14 0 33 10 1 34 22 1 35 12 1 36 1 1 37 1 0 38 11 1 39 7 1 40 38 0 41 16 1 42 1 1 43 24 0 44 40 1 45 33 1 46 11 1 47 30 0 48 8 1 49 39 0 50 17

ycasex

1 51 31 1 52 15 0 53 25 0 54 0 0 55 11 1 56 33 0 57 36 0 58 29 1 59 40 0 60 28 0 61 19 0 62 22 0 63 28 0 64 21 1 65 5 1 66 22 0 67 38 1 68 12 1 69 32 1 70 37 0 71 34 0 72 33 0 73 28 1 74 4 1 75 12

ycasex y

1 76 28 1 1 77 33 1 1 78 5 0 0 79 37 1 0 80 9 0 1 81 26 1 1 82 15 1 1 83 23 0 1 84 1 0 1 85 22 0 1 86 18 1 0 87 34 1 1 88 6 0 0 89 28 0 0 90 11 0 1 91 8 0 1 92 15 1 0 93 5 1 1 94 3 0 1 95 8 0 1 96 29 1 1 97 15 0 1 98 39 1 0 99 32 1 0 100 10 0

Performlogistic regressionto determine in remission (y) depends on the index (x).