The lecture is clear and logical, but you need to spend some time study and practice the material. Smart guy and best prof in pstat department

A solid professor. The material is very hard but he's pretty clear and his tests are pretty fair if you study. He also makes funny comments sometimes which is rare for a stats teacher.

For people who listen to lectures, finish homework and ask questions, getting an A is not hard. He really curves a lot if the tests are difficult and he drops a lot of lowest quizzes. For other people, just avoid taking PSTAT 170 if you want to get a good grade.

Decent teacher and knowledgeable but tests (worth 80% of final grade) and grading scale are brutal. Roughly half the class received a C- or lower, a third being F's. I took 170 before this and still struggled on his tests. The material is no difficult for upper div pstat, take this class with someone who make it excessively difficult.

Not extremely hard, Chen was the biggest obstacle for this class. Unfairly graded, test material way harder than HW and not enough material to study or reference to. Kind of hard to understand him, his lecturing is all over the place, even his test questions are worded funny. I would avoid if possible.

He was a clear lecturer when teaching the material. He gives about 5 homework throughout the quarter, and 3 quizzes in sections. The midterm and final were both very difficult in comparison to our homework assignments and book problems. The scores were low but he did end up curving the overall scores a little bit. Overall, a really tough class.