Reviews of professor Qian Xiao

Rating: 3.0/5, difficulty: 3.0/5
Professor Xiao, was funny but hard to understand. He tries to explain stuff clearly, but it's very boring material. It's hard to pay attention in class, but he reviews almost everything that is going to be on the tests which are in class. We don't talk about coding much in class so it can be difficult to do the homework which use R a lot.

Rating: 4.0/5, difficulty: 4.0/5
He was a good lecturer but this was genuinely a much harder class than any stat class I'd taken in the past. Tests were not difficult content wise but were all a time crunch. Going to class was very useful though and he gives very clear directions. Homework assignments were graded leniently but tests were graded more harshly.

Rating: 3.0/5, difficulty: 2.0/5
STAT 4220 with Professor Xiao is a very easy course. He assigns a lot of homework, but most of them are easy and doable in an hour. His tests are a little challenging even though he allows a cheat sheet. His lectures are a bit boring. I would recommend taking a class with him to get a good grade.

Rating: 5.0/5, difficulty: 3.0/5
He has an accent but understandable. He is kind and would listen to students. Though not easy, the content in this course is very useful. Need much time to do the homework. The exams are much easier than the hw, as he would discuss the contents covered. Most students get good grades in midterms.

Rating: 4.0/5, difficulty: 2.0/5
This class is pretty easy because we are allowed cheat sheets for the tests. I didn't even show up to class for the 2nd unit and got an A on the exam. Xiao is a chill guy and wants you to succeed in the course. Lectures are recorded. Hws are kind of annoying but not bad.

Rating: 1.0/5, difficulty: 5.0/5
He talks like a textbook & can't explain anything in plain language. Impossible to understand if you're not a math/stats major. 100% abstract theoretical mathematics with no practical application or conceptual explanation. Doesn't work any examples of equations using real numbers. Exams very difficult. One of worst classes I've taken. Avoid!

Rating: 5.0/5, difficulty: 1.0/5
Dr. Xiao has explained the statistical theory and concepts in a concise way. I always enjoyed attending lecture which makes complex topics easy to understand.

Rating: 2.0/5, difficulty: 3.0/5
Dr. Xiao is not great. His classes are still an online format which really isn't the problem so much as he is very vague and rambly when trying to explain concepts. Also, his practice tests and HW aren't really like the exams so he is misleading in that way. He also docks points kinda unfairly on HW and tests.

Rating: 5.0/5, difficulty: 2.0/5
His practice exam is very helpful. He is very patient answering my questions.

Rating: 4.0/5, difficulty: 2.0/5
His class is well-organized and well-constructed and he is always so passionate to teach.