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There is no textbook, and he has very little study material offered in his lectures. He says that a very basic understanding of R is required, but has us doing complicated stuff that even some one like me with 2 years of R use cannot figure out. Avoid at all cost","source_url":"https://www.ratemyprofessors.com/professor/1357778","quality_rating":1,"difficulty_rating":5},{"observed_at":"2026-09-07 15:58:01.601642+00:00","run_id":"20260907T155543-ce3781c4","source_review_id":"UmF0aW5nLTMyMzEyNTIx","source_instructor_id":"rmp:1357778","instructor_name":"Yazhen Wang","course_label":"STAT461","course_id":"STAT 461","course_uid":"course_c3af14b05ef6845e7d2ecd4d","review_date":"2019-10-23 19:45:14 +0000 UTC","comment":"Avoid at all costs. Most disorganized professor I've ever hard. Didn't give any study material for tests and made them extremely tricky. His lectures are impossible to follow, and his homeworks are difficult. He also didn't follow a textbook so there was no way to find outside help.","source_url":"https://www.ratemyprofessors.com/professor/1357778","quality_rating":1,"difficulty_rating":4},{"observed_at":"2026-09-07 15:58:01.601642+00:00","run_id":"20260907T155543-ce3781c4","source_review_id":"UmF0aW5nLTI1ODA3Nzg4","source_instructor_id":"rmp:1357778","instructor_name":"Yazhen Wang","course_label":"STAT709","course_id":"MATH/STAT 709","course_uid":"course_3aa77a7c307c944aec9fad7e","review_date":"2015-12-22 23:21:16 +0000 UTC","comment":"This is a very hard class, but Wang was an amazing professor! He always explains difficult material in a very clear and intuitive way, and tests are fair. If you have the choice, take his class!","source_url":"https://www.ratemyprofessors.com/professor/1357778","quality_rating":5,"difficulty_rating":4},{"observed_at":"2026-09-07 15:58:01.601642+00:00","run_id":"20260907T155543-ce3781c4","source_review_id":"UmF0aW5nLTIyNjMyMzM5","source_instructor_id":"rmp:1357778","instructor_name":"Yazhen Wang","course_label":"STAT479","course_id":"STAT 479","course_uid":"course_1282dc8dbc1e7c5749f7cc41","review_date":"2013-12-21 01:16:43 +0000 UTC","comment":"I'm a stats major, and I wish I had never taken this class. The professor was very unorganized, and the TA was not helpful either. It didn't help that this was a 8:50am class. I got a good grade, but I feel like I learned nothing. I wish I could have chosen another stats course.","source_url":"https://www.ratemyprofessors.com/professor/1357778","quality_rating":2,"difficulty_rating":2},{"observed_at":"2026-09-07 15:58:01.601642+00:00","run_id":"20260907T155543-ce3781c4","source_review_id":"UmF0aW5nLTIxMzE5ODE3","source_instructor_id":"rmp:1357778","instructor_name":"Yazhen Wang","course_label":"451STAT","course_id":null,"course_uid":null,"review_date":"2013-02-04 17:13:08 +0000 UTC","comment":"Wang is a great teacher. He is easy to understand and explains things really well. He is good at explaining the hard stuff and the good stuff, as well. It is easy to get an A and the exams are pretty straightforward. Great teacher! Try to get him if you can!","source_url":"https://www.ratemyprofessors.com/professor/1357778","quality_rating":5,"difficulty_rating":1},{"observed_at":"2026-09-07 15:58:01.601642+00:00","run_id":"20260907T155543-ce3781c4","source_review_id":"UmF0aW5nLTIxMjg1ODAw","source_instructor_id":"rmp:1357778","instructor_name":"Yazhen Wang","course_label":"MATH309","course_id":"MATH/STAT 309","course_uid":"course_2a00c702ff402614a950606e","review_date":"2013-01-22 19:32:21 +0000 UTC","comment":"The \"required\" textbook was never used once, so don't buy it. Wang is at time difficult to understand. I had taken Math 431 (Theory of Probability) before this class, so I had a pretty good grasp on the material, but I could see it being difficult for those without much of a stats background. 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