Explain propensity score matching with an example
Last updated: March 12, 2026
Quick Overview
Explain propensity score matching in simple terms and provide a concrete example.
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Explain propensity score matching in simple terms and provide a concrete example.
This statistics question from Pinterest's Take-home Project tests your ability to apply mathematical reasoning to practical problems. The interviewer expects precise definitions, correct methodology, and awareness of assumptions and limitations.
What the Interviewer Expects
- Derive results from first principles when needed
- Handle complex scenarios with multiple interacting variables
- Design experiments that account for real-world complications
- Discuss advanced topics: Bayesian methods, causal inference, resampling
- Connect statistical concepts to business decision-making
- Identify subtle errors in reasoning (Simpson's paradox, survivorship bias)
Key Topics to Cover
How to Approach This
- Define your hypotheses (H0 and H1) clearly before performing any test.
- Calculate required sample size BEFORE running an experiment, using power analysis.
- Remember the Central Limit Theorem: sample means become approximately normal with large n.
- Watch for Simpson's paradox. Always segment data by key dimensions.
- Distinguish between statistical significance and practical significance.
Possible Follow-up Questions
- What alternative statistical method could you use here?
- How would you design a follow-up experiment based on these results?
- What if the sample size is very small?
- What assumptions does this test make, and how would you validate them?
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Problem Formulation
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Solution Approach
The solution to applying propensity score matching can be broken down into several steps:
- Estimate the Propensity Score: Use logistic regression or another statistical model to estimate the pro...
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