2. Construct a life table using intervals of 6 months (so that the cut-points are 0, 6, 12, etc.) 3. Use the life table to construct a survival function or step function The following table shows survival times for 17 consecutive patients with brain metastases from lung tumors who were treated with hyperthermia plus nitrosoureas Time n e C q P S 0 17 4 6 13 1 12 10 4 18 4 2 24 1 1 30