PDT Partners Regression, ML & Time-Series Interview

What the round is, what PDT Partners asks, and how to prepare, from candidate reports and the QuantVault practice set.

Stage 4 of 545-60 min14 practice problemsUpdated October 20, 2026

The PDT Partners Regression, ML & Time-Series interview is stage 4 of 5 in the PDT Partners interview process, after the Probability & Statistics. Format: 45-60 min - research. Regression pitfalls, machine learning, linear algebra, and time-series with a research flavor.

Preparing for this round? Practice the 14 questions mapped to the PDT Partners Regression, ML & Time-Series, with worked solutions. A free account saves your progress.

Practice this round Create a free account

What the Regression, ML & Time-Series tests

QuantVault maps 14 practice problems to this round. By topic, the biggest groups are regression (5), machine learning (4), time series (3), linear algebra (2); by difficulty, 2 easy, 12 medium and 0 hard.

How to prepare for the Regression, ML & Time-Series

Time-series CV -- walk-forward, purge, embargo.
Bias-variance / regularization judgment.

Further reading: How quant superdays work · Behavioral questions at trading firms · Market-making game interview guide.

Question types in this round

The 4 largest question types in the PDT Partners Regression, ML & Time-Series practice set; across them the most common sub-topics are matrix operations, regularization, convex optimization, cross validation, eigenvalues, hypothesis testing. The questions themselves, with worked solutions, are in the round practice.

Prepare with QuantVault

PracticePractice the Regression, ML & Time-Series round14 mapped problems, 1 free Interview funnelAll 5 PDT Partners roundsThe full funnel, a practice set for each stage Firm guidePDT Partners interview guideEvery round, tracks, timeline, pay and a prep plan Online assessmentPDT Partners online assessment guideFormat and practice Problem setPDT Partners interview questionsEvery question tagged to this firm Related problemsRegression interview questionsWorked solutions CourseStatistics & regression course4 lessons Next roundOnsiteFinal rounds - the toughest reported problems

Compare with similar firms

Frequently asked questions

What is the PDT Partners Regression, ML & Time-Series interview?

It is stage 4 of 5 in the PDT Partners interview process, after the Probability & Statistics. Format: 45-60 min - research. Regression pitfalls, machine learning, linear algebra, and time-series with a research flavor.

How long is the PDT Partners Regression, ML & Time-Series interview?

Candidates report: 45-60 min - research.

What questions come up in the PDT Partners Regression, ML & Time-Series interview?

The practice set QuantVault maps to this round centers on regression, machine learning, time series.

How should I prepare for the PDT Partners Regression, ML & Time-Series interview?

Time-series CV -- walk-forward, purge, embargo. Bias-variance / regularization judgment.

What comes after the Regression, ML & Time-Series?

The Onsite (stage 5 of 5). Format: Final rounds - the toughest reported problems.

Practice the PDT Partners Regression, ML & Time-Series round

Work the 14 mapped practice problems with progress tracking, then move to the next stage of the PDT Partners funnel.

Practice the Regression, ML & Time-Series round Create a free account PDT Partners interview guide PDT Partners online assessment All 5 rounds