Gregory Elliott的黄段子

Professor Gregory Elliott年过50,矮矮的个子,大大的肚子,嗓音洪亮,擅长讲笑话与恶作剧,有时过于钻牛角尖。比如,去年秋季在我们系传统的faculty vs. graduate students的排球对抗赛上,他作为faculty方的场上队员,居然在光天化日,全系几十师生的众目睽睽之下,对着graduate students方的场上女队员大喊大叫做鬼脸,吓得该名女队员不敢在网前击球。
Gregory教授了多年的本科生社会统计课,这个学期是我第一次给他作这门课的TA。大半个学期下来,已经充分领略了他的幽默,不过今天才算是知道了他讲笑话的极致。
话说今天上课讲F-test,Gregory想举个比较男女收入的方差的例子,于是爆出了一段精彩的对话。
Gregory先问教室里的一百来号学生想把男性还是女性的收入的方差作为分子,但他问得方式太牛了:would you like to have male on top, or female on top?
话音刚落,全班(包括我在内)厥倒了一半,男男女女们不怀好意、色迷迷的笑声更是响彻教室。
更绝的是一位坐在前排的女生大胆的回答道:female on top!
我咬了一半的牛角包吐了出来,又迅速被我塞了回去。
Gregory的脸上也出现了不怀好意的笑,他紧接着此女的回答又追问了一个问题,于是全班剩下的另一半学生们也厥倒了:female on top to start with, or to end with?
 

About Hongwei Xu

I'm a social demographer, a single-child, a husband, and a father.
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4 条 Gregory Elliott的黄段子 的回复

  1. liao说道:

    很久没更新了噢!
    踩一下.
     
    顺便问一句:female on top to start with or to end with 跟把方差作分子有什么关系?

  2. sophia说道:

    偶就喜欢这样的上课风格!老徐,你何时毕业啊?

  3. Hongwei说道:

    to Ar Liao:Let F(v1,v2) be an F ratio with v1 degrees of freedom in the numerator and v2 degrees of freedom in the denominator, while F(v2,v1) be an F ratio with v2 degrees of freedom in the numerator and v1 degrees of freedom in the denominator. Then it is true that, for any positive number C,
    p[C<=F(v1,v2)]=p[F(v2,v1)<=(1/C)]
    which is to say that the probability that F(v1,v2) is greater or equal to some number C is the same as the probability that the reciprocal of F(v1,v2) is less than or equal to the reciprocal of C.
    所以在实践中,如果我们要求F(male/female)大于等于某个常数C的概率,那可以把问题等价变换为求F(female/male)小于等于1/C的概率,也就是所谓的to start with male on top, but to end with female on top,呵呵
     

  4. Hongwei说道:

    to 三娘:今年第二年了,顺利的话还有三年搞定。你是不是开始工作了?

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