疑惑：从今天我的分数和hemiji的分数，发现点GMAT算分的诡异逻辑

LinsonLi

以下是引用hemiji在2009-2-14 9:19:00的发言：

嗯，我看了你的JJ了，第一篇和第四篇是一样的，题目好像也差不多。不过我是把题目做完了。

不知道你做到后十道题得时候感觉SC难不难，我的感觉是比前面简单了

我做第四篇阅读的时候明显感觉比前面三篇简单，不知道你是不是这种感觉。如果是，那要么就是不做完会扣很多分，要么就是这篇阅读是测试题，不算分，呵呵

zhangyiding

我那天模考，V前10个错了3个还是4个，一共错了13个，连错的有两次，都是三连错，但有一个三连错实在最后3道好像，居然有35分，觉得很诡异啊。

cathyzq

我也觉得，今天的做的PREP好像M感觉比平时错的多，却成绩比我错几个还好。V错的个数比平时少，但是分数不高。不知道为何？很奇怪。。。

vera_song

我上新东方的时候老师就特别强调过，题目一定一定要做完！不然真的会扣狠分的。

jzf

但是老管强调是空掉的，乱点就等于连错，会死很惨

LinsonLi

所以，我总结，还是自己正确率提高、速度提高最靠谱，其他的都不靠谱，呵呵

sunwenq

Pace yourself so that you have enough time to answer every question. Pay attention to the number of questions and the amount of time remaining during your testing session. On average, you have about 1¾ minutes for each verbal question and about 2 minutes for each quantitative question. (If you do not finish in the allotted time, you will still receive scores as long as you have worked on every section. However, your scores will reflect the number of questions answered, and your score will decrease significantly with each unanswered question.)

Your GMAT scores will depend on several characteristics of the questions presented to you, including difficulty level, your answers to those questions, and the number of questions you answer.  Adaptive test score calculations do not assign any differential credit to questions depending on where they appear in the test. The questions in an adaptive test are weighted according to their difficulty and other statistical properties, not according to their position in the test.

Taken from: http://www.mba.com/mba/TheGMAT/PrepareForTheGMAT/TestTakingStrategiesNEW.htm

[此贴子已经被作者于2009-2-15 14:53:36编辑过]

LinsonLi

以下是引用sunwenq在2009-2-15 14:50:00的发言：

Pace yourself so that you have enough time to answer every question. Pay attention to the number of questions and the amount of time remaining during your testing session. On average, you have about 1¾ minutes for each verbal question and about 2 minutes for each quantitative question. (If you do not finish in the allotted time, you will still receive scores as long as you have worked on every section. However, your scores will reflect the number of questions answered, and your score will decrease significantly with each unanswered question.)

Your GMAT scores will depend on several characteristics of the questions presented to you, including difficulty level, your answers to those questions, and the number of questions you answer.  Adaptive test score calculations do not assign any differential credit to questions depending on where they appear in the test. The questions in an adaptive test are weighted according to their difficulty and other statistical properties, not according to their position in the test.

Taken from: http://www.mba.com/mba/TheGMAT/PrepareForTheGMAT/TestTakingStrategiesNEW.htm

这个大家肯定都看过了，但不是有V只答了35个就得高分的例子么，所有就有了各种说法。

而且我考前正巧看了这篇帖子：

http://forum.chasedream.com/dispbbs.asp?boardID=34&ID=371849&page=2

现在感觉后悔死了。呜呜……

hemiji

以下是引用LinsonLi在2009-2-14 16:12:00的发言：

不知道你做到后十道题得时候感觉SC难不难，我的感觉是比前面简单了

我做第四篇阅读的时候明显感觉比前面三篇简单，不知道你是不是这种感觉。如果是，那要么就是不做完会扣很多分，要么就是这篇阅读是测试题，不算分，呵呵

SC的话，好像没有觉得难度有很大的变化，每题都不算太长，但满绕的，有陷阱，很多我都凭语感来了。

RC的话，我是觉得第二篇货品摆放和第三篇DAM满难的，首先文章长，当然背景的话看JJ还是有所了解了，可是题目长得都像逻辑题，而且有的题我真的是定位原文后还有若干个选项无法选择。第四篇是算简单的了，特别是第一题那个except题。

xyskyer

不妨来建模，抛砖引玉。根据上面各位说的理论，V部分的评分可以如下表达：

变量：

Score：故名思议，分数。

Total accuracy：总共作对的正确率（即：作对的题目/总题目数）

设每10道题（不一定是严格的10题，但是根据有人提出的分法，姑且已10题算）为一个section，则V部分考斯一共有4个section（最后一个section有11题），分别设每个section的正确率为S1-S4。

CE(continuous errors）：有人提出连错会影响评分，故设有此变量，其值为0.1^N（N为对应section的连错题数，即连错越多，分数也会越小，至于为什么是0.1，我只是随便设的。。。）,CE1为section1的CE值。

T（total score），T= ∑（DI（每题的难度系数）* CONSTANT（就是一个分值，可以理解为平均每题的分数））

常量：

A，B,C，D：均为加权数，关系为A>B>C>D.

方程：

Score=( Total accuracy*A+ S1*B*CE1 +S2*C*CE2 +S3*C*CE3 +S4*D*CE4)*T

说明：我是假设了总体正确率是最高权重的，然后是前10题，11-30题次之，最后11题最低。粗略列出上面的假设，暂时觉得可以解释我们遇到的情况，希望牛人出来完善（如果能接近GMAC的算分公式，那就无敌了，呵呵，长期被GMAC压迫，导致狂想症，见谅见谅）