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Teaching Evaluation 2026
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Today I received this year’s teaching evaluation. My PhD course always had high scores, which I didn’t worry about. What concerned me was the master’s course of data science.
Python or R? Not a Question Anymore
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Hong Kong shares a land border with Mainland China, featuring nine major land-based control points. Most drivers in the two sides, however, do not attempt to cross the border, partly due to insurance complexity over the two jurisdictions. There is a much more important reason: Hong Kong uses left-hand traffic, following U.K., while Mainland uses right-hand traffic, as in most continental countries. Faint-hearted drivers can easily get confused over the other side. Almost 30 years after Hong Kong’s return, this misalignment remains and no one attempted any change. A solution is foreseeable, though. Once driving becomes fully autonomous, which side the steer wheel is mounted is irrelevant. AI does not sit on the left or right.
Data Science in the Era of AI
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Data science will be here to stay.
Likelihood
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When I taught a graduate-level course last week, I asked students “Did you learn maximum likelihood estimation in your undergraduate statistics”? Not a single hand was raised. Perhaps students were too shy to signal their knowhow.
怀念何英华兄
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忙碌的七月初变成纷扰的季节。7月初某日清早，我看到师姐发朋友圈，悼念她的某位未提及姓名的兄长过世。傍晚，我在公共社交媒体上惊闻何英华师兄病故。我和英华久未联系，并不知道他的近况。震撼不已。
怀念徐晓宏兄
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晓宏和我都在浙江出生和长大，也都曾在北大求学。晓宏年长我几岁，我们到了耶鲁才通过共同的朋友而相识。他研究的是社会学，而社会学和历史紧密相连。我总觉得晓宏研究社会学问题宏大，抽象，难以琢磨把握。
PhD之路
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This post combines multiple separate posts in Zhihu about related topics.
本科经济学入门教学
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最近帮一个学校评审课程。该学校的《经济学入门》采用曼昆的教材。授课老师自己不添加新内容，直接借用出版公司提供的幻灯片。我给这老师的评价说，这样对学生是不负责任的。
研究生计量经济学教学
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This post combines three separate posts originally shared on Zhihu.
Letters to Students (2018)
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Notes: When I taught Econ5121A in the fall semester of 2018, I wrote 12 weekly letters to students. In 2024—five years later, I shared these historical messages to keep a record of teaching and common experience with students. These messages have been edited by removing the mentioning of reading, exercises, and exams.