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发帖数: 6 | 1 第一次是个中国GG，人很nice，问了几个基本问题，没有难为的问题；今天是个外国JJ
，很牛的样子，phd毕业工作了6年，在这个公司刚刚工作两年已经是manager了。
上来来了个自我介绍，然后让偶介绍一下自己；然后就开始问问题了：
1）how to treat missing values;
2)how to do variable selection, say the pool of independent variables is 160
;
3) if x is supposed to have positive relation to y; but the regression
coefficient turned out to be negative, what would you do?
4)if a company is conducting a marketing campaign: it sent 500 catalogues to
500 customers and another 500 catalogues + 20% coupon to another 50 |
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