# S&DS Major FAQs

Yes, you can receive updates on the major by subscribing the S&DS undergraduate student mailing list. After you sign up you’ll be asked to confirm. If you don’t confirm you won’t be on the mailing list.

YCPS has information on the first year.

In general you should try to complete the calculus pre-req, linear algebra, category A, and category B courses sooner than later. This will give you a good foundation for most upper level courses.

Any S&DS faculty can be a sophomore advisor. We suggest you review the faculty websites and identify a few that are working on things of interest to you. Then contact the faculty member and see if they are willing to advise you. If you have troubles finding a suitable advisor then contact the DUS.

These questions can be answered by your residential dean. See also the Yale College advising website.

Cr/D/F is being phased out. Currently only the class of 2021 is elgible.

The Yale policy states the Cr/D/F option exists to “encourage academic experimentation and to promote diversity in students’ programs.” The DUS will determine eligibility by seeing if the proposed course is a diversity course relative to the other courses you’ve taken and relative to other S&DS majors. Please consult with the DUS if you want to use Cr/D/F for a course.

Cr/D/F is not allowed for the pre-requisite requirement.

You need to provide the DUS evidence demonstrating your proficiency in the course material. For example if you took a similar course elsewhere then provide information such as: syllabus, textbook, exams, problem sets, etc. In addition list any advanced courses you’ve taken at Yale that depend crucially on the course material.

For courses taken outside of Yale, there are two options for getting credit:

- Get Yale credit for the course (this is done through your College Dean). Then, if I’ve approved your course for the major, your total course count goes down by one.
- Don’t get Yale credit. If I’ve approved the course I’ll waive the appropriate category requirement but you’ll have to take an extra elective to maintain the total course count.

It is best to contact the instructor and ask if you have a suitable background for the course, whether the prerequisites are strict or not, and whether prerequisities can be taken concurrently.

The first step is to find an advisor. Ideally, a student will think of a research project, and then find a faculty member who is willing to help supervise it. The faculty member will often suggest changes to the proposed project. Other students find advisors by approaching faculty members they know and asking if they can propose projects. It is strongly advised that you identify your advisor and research project the semester before you enroll in S&DS 490-492.

Stat 238 and 241 overlap substantially but are quite different, and choosing one over the other involves tradeoffs. Overall I think they are both good courses and, from what I understand of your situation, you should feel free to choose either.

If you are planning to take further statistics courses such as 242 and 251, then the more standard choice would be 241, and I’d say you can’t go wrong with this choice. Stat 241 has been taught for a very long time, and the courses 242 and 251 were designed to follow 241.

Stat 238 was added to our course offerings much more recently. Our original question motivating the development of 238 was: for a student who is thinking of taking just one course in the whole area of probability/statistics/data analysis, hoping to learn as much as possible in one semester, what would we teach them? It has turned out that many Stat 238 students go on to take more statistics (including declaring a statistics major), but that was the original concept.

In contemplating taking Stat 241, you should definitely not worry about not having taken a statistics course before, and it is not true that 241 is less suitable for people with no prior experience with statistics than 238 is, since they both assume no prior experience with statistics, and just assume the mathematical prerequisite that you have.

What are those tradeoffs? Stat 241 focuses on probability theory and tends to emphasize mathematical developments more, and Stat 238 includes a substantial amount of statistics and computing together with some math. That is, typically (of course it varies with different instructors) Stat 241 feels more like a math class, and Stat 238 mixes in statistical inference (from a Bayesian viewpoint, which is a bit unusual for a course at this level), computing, and some data analysis. You can expect to get more time and practice and depth with Probability Theory in 241 than in 238. Stat 238 includes topics that overlap (but from a somewhat different point of view and perhaps for different purposes) with 242 and 251, such as using likelihood for statistical inference (which also is done in 242) and Markov chains (which are also done in 251). From that point of view, students who come out of Stat 238 and then take 242 or 252 may feel that they are already comfortable with some concepts that others in those classes are seeing for the first time, which could be viewed as an advantage, but they may feel that their command of probability theory is being taxed more than the students coming out of 241, which is a disadvantage.

In 238 I would say you get enough probability theory that you are prepared to take 242 and 251, and in this regard differences between how well individual students “got” the respective classes (238 or 241) are probably more important than which class they took, but the median student in 241 probably has a more solid command of probability theory than the median student in 238. The 238 students probably have some additional useful perspectives and insights (as well as skills in computing and simulation) that could help them understand and appreciate some of the things they are about to learn in 242 and 251, and the hope would be if they feel a need to strengthen any particular aspect of probability theory while taking 242 and 251, it would not be a problem to do some review or a bit of extra reading, perhaps in a Stat 241 textbook.

S&DS majors cannot receive the Certificate in Data Science.

No. S&DS 240 and S&DS 355 are meant for S&DS certificate students. Majors should take S&DS 241 and S&DS 365. We want majors to be challenged!