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[面试] NCSU analytic面经

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wwy 发表于 2014-2-12 03:54:18 | 显示全部楼层 |阅读模式


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behavior: 问为啥申请analytic,对analytic有什么认识。
Technical:问linear regression。非术语解释linear regression。
问你对这个program有什么contribution。(楼主说自己会找个工作,不会拖累他们的placement,实在想不出来其他的。。。把他们都逗乐了). 鐗涗汉浜戦泦,涓浜╀笁鍒嗗湴
Linear regression: an approach to modelingthe relationship between a scalar dependent variable y and one or moreexplanatory variable x.
P-value: the probability ofobtaining a test statistic at least as extreme as the one that was actuallyobserved, assuming the null hypothesis is true. Aresearcher will often reject the null hypothesis when the P-value turns out tobe less than a certain significance level.
Type I Error: the incorrect rejectionof a true null hypothesis.
Type II Error: failure to reject afalse null hypothesis.
Mode: the most frequent orcommon score in the distribution.
Positively skewed: it has a tail extendingout to the right.
Negatively skewed: it has a tail extendingout to the left.
Standard deviation: it is an indicator of thevariability of a set of continuous scores around the mean.
Variance: The variance of a set of scores is simply thestandard deviation of that set of scores squared.
Statistical Inference: statisticalinference makes use of information from a sample to draw conclusions about thepopulation from which the sample was taken.
Central Limit TheoremThe Central LimitTheorem states that whenever a random sample of size n is taken from anydistribution with mean μ and variance file://localhost/Users/vivian/Library/Caches/TemporaryItems/msoclip/0/clip_image002.png, then the sample mean file://localhost/Users/vivian/Library/Caches/TemporaryItems/msoclip/0/clip_image004.png will be approximately normallydistributed with mean μ and variance file://localhost/Users/vivian/Library/Caches/TemporaryItems/msoclip/0/clip_image006.png/n. The larger the value of the samplesize n, the better the approximation to the normal. Quartile: values that divide a sample of data into fourgroups containing equal numbers of observation.Coefficient of Variation:t is the ratio of the sample standarddeviation to the sample mean:file://localhost/Users/vivian/Library/Caches/TemporaryItems/msoclip/0/clip_image008.pngQQ plot: it is used to see if a given set of datafollows some specified distribution. It should be approximately linear if thespecified distribution is the correct model.Power: the probability of rejecting the nullhypothesis when the null hypothesis is false.




somoya 发表于 2014-2-12 09:03:13 | 显示全部楼层
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塔蒂尼 发表于 2014-2-13 19:17:01 来自手机 | 显示全部楼层
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Vicallen 发表于 2014-2-15 00:06:20 | 显示全部楼层
lz赞一个!!! 你给的参考正是想要的!
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adamzjw 发表于 2014-2-16 14:41:49 | 显示全部楼层
cong! NCSU 好项目
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