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标题: [求助]请教OG第10版87题 [打印本页]

作者: ggyum 时间: 2006-4-21 19:06
标题: [求助]请教OG第10版87题

问一道CR题，OG第10版 87题。totaly不明白答案在讲什么？哪位高手解释一下？

87. 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.

答案是E，一下是解释，俺看了解释也不明白，请高手赐教

87.

The most accurate test for pironoma would be the one with the fewest false results. If all tests

have the same proportion of false negatives, then the most accurate is the one that has the

lowest proportion of false positives. Thus, E supports the recommendation and is the best

answer.

Choice A and C deal with the treatment for pironoma and are irrelevant to the accuracy of tests

pironoma. Choice B deals with the side effects of tests for pironoma, and does not address

their accuracy. That the proportion of inconclusive test results is equal for all tests (choice D)

leaves open the question of which test is more accurate, since it does not indicate which test

has fewest false results.

作者: yaxin21 时间: 2006-4-22 08:33

这题讨论过

http://forum.chasedream.com/dispbbs.asp?BoardID=24&ID=46431

http://forum.chasedream.com/dispbbs.asp?boardID=24&ID=90184&page=1

作者: jdmg 时间: 2006-4-22 12:07
我理解，这题一定要清楚地记得negative就是有病，那么，假设它试验了N组，每组假设有1W个Sample，如果每组的Negative（就是有病）的比例一样，那么选Positive（没病）最少也就是说：干扰的错误样本最少，当然对研究有利。你说呢？

作者: ggyum 时间: 2006-4-22 22:15

嗯，明白了。谢谢 jdmg 和 yaxin21

我自己的总结是：两个(或者多个）因素共同决定一个test的好坏，比较其中一个因素并不足以确定这个text是否好，而必须建立在除了这个因素的其他因素必须相同的基础上～～～～～

作者: gonghao 时间: 2006-6-24 17:12
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