uwloo

STAT 901Theory of Probability 1

Units
0.50
Level
Graduate
Faculty
Mathematics
Subject
Statistics

When it runs

  1. F24
  2. W25
  3. S25
  4. F25
  5. W26
  6. S26
  7. F26
  8. W27
  9. S27

Ran in 3 of the last 7 terms. Winter 2027: not on the schedule. Spring 2027: schedule not out yet.

Probability measures, random variables as measurable functions, expectation, independence, characteristic functions, limit theorems, applications.

Prerequisites

None listed.

Antirequisites

None listed.

Leads to

No course lists it as a requisite.

Fall 2026 sections

Enrolment from UW Open Data, which can trail Quest by up to two days. Instructors and rooms: Schedule of Classes.
SectionClassEnrolledMeets
LEC 001605311 / 40MW 14:30–15:50

Discussed on r/uwaterloo

67 posts and comments in 44 threads mention STAT 901, February 2016 to December 2024. Quoted word for word, newest first; each reply sits under the post and the comment that started its branch. Search r/uwaterloo for newer posts.

Fall 2023

Waterloo undergrad apply for Waterloo grad school 1 point, 4 comments

“Is there any advantage for Waterloo undergrad during the application?”

u/Royal-Derpness: “Is Waterloo mqf a good program? Or is it just a cash cow?”

u/Not_So_Deleted: “… The courses (STAT 901/902/908) are quite rigorous, as PhD students in the Statistics program only need to take one of those. Even if it doesn't have funding, I wouldn't consider it a cash cow as it's still way cheaper than many other professional programs (e.g. …”

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Winter 2023

How hard would it be for to get into MQF? 2 points, 4 comments

“Hi there, For context, I'm going to enter 4th Year Mechanical Engineering this year, and am planning to apply for Quantitative Finance Master's either for MMF at UofT or MQF here. …”

u/LuK413: “… MQF is very theoretical and you will be taking STAT901, 902 and 906 which will require measure theory. …”

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Fall 2022

STAT 902 Undergraduate? 1 point, 11 comments

u/Novel_Brain9700: “Has anyone ever taken STAT 902 as an undergraduate before? What do the instructor usually ask as a prerequisite for the course? Do you actually need to take STAT 901 first (I heard that you need PMATH 451 for this)”

u/vkoj1221: “I havent taken STAT 901 or STAT 902 but I was allowed to take STAT 901 (as an undergrad with PMATH 450 but no STAT 330). I dropped out of the class because it was looking a little bit like PMATH 451 but easier. I imagine that overriding in is instructor dependent.”

u/AcademicAdvisorBot: “It is indeed instructor dependent as to whether or not you will be allowed to take STAT 901 without having taken STAT 330 or 902. You should contact your instructor to find out if overriding in is possible.”

u/asdfg_lkjh: “Idts if you're allowed to take 9xx courses as an undergrad”

u/blank_anonymous: “You're allowed to - I've taken pmath 950 and 965, and I have friends who have done stat 901. You need permission of the professor, and the academic advisor. …”

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What should I do to get approval of 7 courses? 2 points, 35 comments

“Hi everyone. I'm in the Faculty of Mathematics -- and I'm aiming to take 7 courses at some point (it's something like 6 math and 1 elective) from 3A onwards. …”

u/djao: “The actual answer is here: https://www.reddit.com/r/uwaterloo/comments/n62nf0/whataretherequirementstotake6or7courses/ Source: I am on the S&P committee. …”

u/Fatdayuu: “As a DS major right now, my advisor is Riley, which is the person I never want to talk with. He rejected me and my friend to take stat901 in fall 21 and rejected me to take stat333 in fall 20 although I have a very strong background. :(”

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Winter 2022

Am I dumb for not being able to do stat230 9 points, 15 comments

“I literally have no idea why, but I've never been able to do fucking probability. Of all things. It was the easiest topic for everyone in my high school math class, but I could never wrap my head …”

u/im_an_asian_nerd: “… Look at STAT 240 if you're curious (or STAT 901 if you're brave). As for combinatorics in event counting, I still suck at that even after graduating as a stats major lol. …”

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Fall 2021

Imagine Calling Yourself An University of "Beyond Ideas" when You Cockblocked Students from Taking Unusual Steps 137 points, 29 comments

“&x200B; https://preview.redd.it/musbbocny3l71.png?width=666&format=png&auto=webp&s=f3ee68db7b83cf57c7bd8d352a3a6b398cb289db”

u/Fatdayuu: “Riley is 💩 :) Which course he didn’t allow you get in?”

u/dotuanhiep: “STAT 901. Now I’m fucked because this is my last Fall term and the course is only offered in the Fall. It’s also one of the most important courses too since I’m planning on going into Probability Theory.”

u/djao: “I'm not riley, but I am the C&O advisor, and I can explain why we would do something like this. In C&O, you do not need advisor approval in order to enrol in a graduate course as an undergrad. …”

u/djao: “… A realistic set of prerequisites for STAT 901 might be "PMATH 450 and PMATH 451". It's pretty rare for a student who's not in 4A to have met these requirements. …”

u/djao: “… In truth, I would be more impressed by an aspiring probability student who had taken PMATH 450 + 451 than one who had taken PMATH 450 + STAT 901. The former choice indicates a healthy respect for theory and fundamentals. …”

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Spring 2021

Is STAT 433 important? 0 points, 1 comment

[deleted]: [deleted]

u/dotuanhiep: “Oh sorry about that, I got a lot of downvotes so I thought I might come off as too arrogant or something (I believe it's because I mentioned STAT 901 so they might think I'm humble bragging). That's good to know, thanks!”

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Software in math 5 points, 10 comments

“How many math classes at Waterloo expect you to program in it . I am horrible with software , I hate cs and R but like those classes require me to program and I hate it . …”

u/blank_anonymous: “… Stat 240 is also rigorous and proof based and theoretical, and it serves as a nice little preview for PMath 450/451 and stat 901. Outside of those courses, PMath requires no coding. I think that PMath 370 uses coding, but that's not a course you need to take as a pmath major. …”

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9XX Courses 2 points, 3 comments

u/dotuanhiep: “Has anyone taken more than one 9XX course in a term before? Will 2 be too much? I’m thinking of taking PMATH 940 and STAT 901 but I’m just scared that I’m going to die.”

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Check it elsewhere for Fall 2026

Calendar versions

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In 42 terms, Fall 2006 to Winter 2024