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标题: 参考已知生存曲线进行生存分析样本量估计时遇到的问题？ [打印本页]

作者: shiyiming 时间: 2013-11-1 11:29
标题: 参考已知生存曲线进行生存分析样本量估计时遇到的问题？
我用以下代码估计样本量时，想根据已有的报告给出曲线，但总是报错，不知道该如何解决。WARNING: The magnitude of the effect is ill-defined in one of the scenarios in the output table.不知道该如何处理？
代码如下
proc power;
   twosamplesurvival test=logrank
      curve("Control") = (0 to 9 by 1):(1.00 0.84 0.57 0.41 0.29 0.19 0.12 0.06 0.03 0)
      curve("Treatment") = (0 to 9 by 1):(1.00 0.95 0.79 0.62 0.48 0.33 0.24 0.10 0.04 0.02)
      groupsurvival = "Control" | "Treatment"
      accrualtime = 6
      followuptime = 6
      npergroup = .
      alpha= .05
      power = .8;
run;

proc power;
   twosamplesurvival test=logrank
      curve("Control") = (0 to 9 by 1):(1.00 0.84 0.57 0.41 0.29 0.19 0.12 0.06 0.03 0)
      refsurvival = "Control"
      hazardratio = 0.37
      accrualtime = 6
      followuptime = 6
      npergroup = .
      alpha= .05
      power = .8;
run;

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