OG 87

[nature]

In tests for pironoma, a series disease, a false positive result indicates that people have pironoma ehwn, in fact, they don't ; a false negative result indicates that people so not have piromoa, when, in fact , they do. To detect pironoma most accurately, physicians should use the labortory test that has the lowest propotion of false positive results.

All labortory test to detect pironoma have the same propotion of false negative results.
請問..所有的 labortory test have the same propotion..怎麼還會產生 lowest propotion 不是應該就一樣的嗎?
不懂...請幫忙解答

[Ethan]

“狼來了” 總是希望越少越好。
真的“狼來了”總是希望越真越好。

[nature]

補充解釋一下喔
上面是題目..答案要找能support的
而下面一行是答案

sorry...還是不太懂你的解釋...能再說的更清楚些嗎..謝謝

[Ethan]

ask yourself why the reson of supporting the conclusion is the most valid
among other choices?

[Ethan]

假如100個tests中每一個都有50%的false negative results, 那麼我們就可以排除2個possibilities(false positive result& false negative result)中的其中一個了。

[nature]

謝謝

[James]

lowest propotion of false positive results 最低是指偽陽性，
the same propotion of false negative results 相同是指偽陰性。
兩者所指的東西不同

[bakekab]

再偵測疾病的時候 最好是 false positive 比例 跟 false negative 比例 都要很低 的 test 是最好的
題目說 現在醫生 採用 the laboratory test that has the lowest proportion of false positive results.(有最少的 false positive 比例 的test)

假若一個test 雖然 false positive 比例 很低 但是 false negative 比例 很高 這應該也不是一個好的test 答案e 提示說 所有test 的 false negative 比例一樣 在這種情況之下當然採用 false positive 比例 最低的test 是最精確的

[agk99]

樓上解的很清楚喔

[joke]

想很久
但是看完bakekab的解釋真的是豁然開朗
謝謝

[meishan]

bakekab真的解釋得超好的，
感謝感謝！

[Mike340]

謝謝樓上的解惑,但是小弟有一個疑問...就是在(E)的選項當中,不是設定the same

proportion of false negative results嗎?那要如何找出the lowest proportion

of false positive results呢?(不是比例也都一樣嗎?)

[dibert8]

題目:
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.


Answer : (E)

[chencraig0227]

恩恩! 解釋得超好!

[chencraig0227]

恩恩! 解釋得超好!

.......我哩...OX! 結果我自己做第二次又錯!!!
經過仔細推敲後 我一次解釋出來 給大家聽 也可自己聽!!

我們來假設實驗測試有三種結果- 偽陰 偽陽 其他

(模擬情境) 假裝有三次測試結果如下-

兩種假設： 偽陰部分不固定VS偽陰部分固定

Test 1: 偽陰 30% (30%) :偽陽 20%
Test 2: 偽陰 40% (30%) :偽陽 30%
Test 3: 偽陰 50% (30%) :偽陽 40%

很明顯的 藍色部分的條件下 才可以用test 1的結果當作最終結果(偽陽最低)

大家仔細比較一下就知道! 當最低偽陽性要成為決定因子時(OG11-解釋)
其他結果的比例要相同。這是一個簡單的數學概念，其他東西要一樣
這樣才能比較嘛!!....

(越寫越對自己生氣)