Blog

2026

Python or R? Not a Question Anymore

3 minute read

Published:

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.

2025

Likelihood

1 minute read

Published:

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.

2023

PhD之路

less than 1 minute read

Published:

This post combines multiple separate posts in Zhihu about related topics.

2022

本科经济学入门教学

less than 1 minute read

Published:

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。

2019

Letters to Students (2018)

12 minute read

Published:

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.