标题: CXD逻辑关于Pironoma的逻辑,始终不明白为什么选E [打印本页] 作者: gedn01 时间: 2009-11-29 10:41 标题: CXD逻辑关于Pironoma的逻辑,始终不明白为什么选E 20. In tests for pironoma, a serious disease, a false positive result indicates that people have pironoma when, in fact, they do not; a false negative result indicates that people do not have pironoma when, in fact, they do. To detect pironoma most accurately, physicians should use the laboratory test that has the lowest proportion of false positive results.Which of the following, if true, gives the most support to the recommendation above? (A) The accepted treatment for pironoma does not have damaging side effects. (B) The laboratory test that has the lowest proportion of false positive results causes the same minor side effects as do the other laboratory tests used to detect pironoma. (C) In treating pironoma patients, it is essential to begin treatment as early as possible, since even a week of delay can result in loss of life. (D) The proportion of inconclusive test results is equal for all laboratory tests used to detect pironoma. (E) All laboratory tests to detect pironoma have the same proportion of false negative results.
a false positive result --fp a false negative result --fn
A,B: the speaker is talking about the accuracy of detectation not concerning about side effects, irrelevant C: Like A&B, the author doesn't concern about the treatment of pironoma, irrelevant. compare D and E: D means percent of 'fp+fn' is equal for all tests, E means the percent of 'fn' is equal for all tests. It can be inferred that D doesn't strengthen that the lowest false positive results is needed.作者: chrisdemo 时间: 2012-4-21 15:04
我来说说吧 文章是plan-goal型，这种文章，无论什么题型，只考虑2个问题，1、plan是否可行；2、如plan可行，能否达到goal 文章前两句是背景信息可以略看，从最后一句我们可以得出：goal-对P的检测更准确；plan-应使用FPR率最低的方法 题目问哪个支持，那我们就找1、使得plan更可行的；2、在plan可行的情况下使得达到goal的可能性增大的 B选项满足第一个条件，使得plan更可行，因为如果FNR率不确定，FPR率也就不能确定； C选项为无关项，文章的argue是关于检测方法的，我们不关心怎么治疗病人作者: sysyman 时间: 2012-12-25 14:40
一个lab好不好，有两个因素，一个因素是false negative 一个是 false positive 文中结论说physicians should use the laboratory test that has the lowest proportion of“ false positive ” results. 那么无论题目问的是假设还是加强，既然比较的是false positive,那么前提都要保证 fase negative是一样的。 (E) All laboratory tests to detect pironoma have the same proportion of false negative results. E说的正好就是这一个问题。