STATS 20
Introduction to Statistical Programming with R
Grades
3.58
Average grade awarded in STATS 20. Not a student rating: this is what the grades were.
In the A range
68%
of the 2,991 letter grades
D, F or W
1.6%
of every letter grade awarded, plus withdrawals
Taken pass/no pass
2%
93% of those passed
The registrar's own records: 2,991 grades over 17 terms, Fall 2021 to Fall 2025. Every instructor is pooled here.
What is inside that record
4 of those terms are summer sessions, and summer sessions are counted here.
The table below splits them, and term averages across those 17 terms ran 3.19 to 3.79.
Historical grades for all professors, across recorded terms. The course summary above includes all professors.
- A+ 223 · 7.5%
- A 1,311 · 43.8%
- A- 498 · 16.6%
- B+ 371 · 12.4%
- B 272 · 9.1%
- B- 153 · 5.1%
- C+ 64 · 2.1%
- C 49 · 1.6%
- C- 10 · 0.3%
- D+ 6 · 0.2%
- D 12 · 0.4%
- F 22 · 0.7%
- P 56 of 3,069
- NP 4 of 3,069
- I 11 of 3,069
- DR 7 of 3,069
Percentages are of the 2,991 letter grades. Grey bars are non-letter outcomes: passes (P), no-passes (NP), incompletes (I), and withdrawals (DR).
How the non-letter outcomes are counted
They are excluded from the GPA entirely rather than scored, because counting a P as a 4.0 would be a fabrication.
Withdrawals are the exception to "excluded": DR is not scored, but it IS counted in the D, F or W figure above, which is reported over the letter grades plus the withdrawals. Pass/no pass and S/U outcomes are outside that figure on both sides.
By instructor
| Instructor | Predicted GPA | Raw | n | Terms | A range | Workload | Fall 2025 |
|---|---|---|---|---|---|---|---|
| TSIANG, MICHAEL reviews ↗ | 3.70 | 3.70 | 1,449 | 10 | 77% | heavy | not teaching it |
| MAIERHOFER, THOMAS JOHANNES reviews ↗ | 3.49 | 3.49 | 886 | 4 | 58% | light | not teaching it |
| ZHOU, QING reviews ↗ | 3.42 | 3.41 | 300 | 2 | 54% | - | not teaching it |
| SPARKS, JOSHUA HARRISON reviews ↗ | 3.41 | 3.40 | 282 | 1 | 59% | - | not teaching it |
| LEW, VIVIAN reviews ↗ | 3.79 | 3.84 | 74 | 1 | 91% | average | not teaching it |
Why Predicted is not the Raw average
“Predicted” is shrunk toward the course average, which is itself shrunk toward the department, so an instructor with a handful of students sits near the course mean rather than topping the list.
Grade records describe outcomes. For what a course is like to take, read student reviews written on dibs below or follow the separate external review link.
Workload and assignments
Work types reported in BruinWalk reviews of this course, across recorded instructors and terms. They may differ from this term's syllabus.
dibs has not read this course’s reviews, so it cannot say what kind of work it sets. That is dibs not having looked. It is not a course without papers or exams, and the reviews linked below are the answer until dibs catches up.
What comes first
The chain dibs can see is 4 courses long before STATS 20. Read from Fall 2026, because dibs has not read a class page for STATS 20 in Fall 2025 and a department can change what it requires. This is a floor, not a deadline: dibs has not read a class page for STATS 12, so the real chain can only be longer than this, never shorter.
Counted in courses rather than quarters: dibs does not know which of them a department lets you take together.
In Falls
Ran in 5 of the last 5 Falls.
From the terms dibs holds, which start in Fall 2021 and exclude summer. A department can run a course in a quarter it never has before.
From the registrar's catalog
Lecture, three hours; discussion, one hour. Enforced requisite: one course from course 10, 12, 13, 15, Economics 41, or Psychology 100A, or score of 4 or higher on Advanced Placement Statistics Examination. Designed to prepare students for upper-division work in statistics. Introduction to use of R, including data management, simple programming, and statistical graphics in R. P/NP or letter grading.
Sections in Fall 2025
From the people who took it
Student reviews
What taking STATS 20 was like: the work, the teaching, and what students wish they’d known.
Your experience could be the first.
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External reviews are separate and do not count toward the dibs rating.