| a question for you to see if |
| 送交者: laobiao 2008月12月08日20:56:22 于 [海 二 代] 发送悄悄话 |
| 回 答: 欢迎反驳，欢迎理性讨论！ 由 言真轻 于 2008-12-08 20:32:08 |
|
you have critical thinking.
an investigator wants to show that a drug can improve patients survival time. So he pick up two groups of patients. one group is those patients who have some response which is based on some lab tests. another groupo is those who have no responses. he found that those patients who have responses live longer and thus claim that his drug can improve patients's survival time. can you trust his conclusion? why? |
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