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本文原文来自LifeHacker，译者@小栾Cooper和@Pushing_Lap。

Zhaomeng 通过 Google 阅读器发送给您的内容：

Introduction

Suppose you ask a bunch of users to rate a set of movies on a 0-100 scale. In classical factor analysis, you could then try to explain each movie and user in terms of a set of latent factors. For example, movies like Star Wars and Lord of the Rings might have strong associations with a latent science fiction and fantasy factor, and users who like Wall-E and Toy Story might have strong associations with a latent Pixar factor.
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What types of students go to which schools? There are, of course, the classic stereotypes:

• MIT has the hacker engineers.
• Stanford has the laid-back, social folks.
• Harvard has the prestigious leaders of the world.
• Berkeley has the activist hippies.
• Caltech has the hardcore science nerds.

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