t-Stat With an Added Orthogonal Regressor, Live Sharpe Check, and Absolute-Loss Estimator
Company: Headlands
Role: Data Scientist
Category: Statistics & Math
Difficulty: medium
Interview Round: Online Assessment
Overview: Three written quantitative questions: how an OLS t-statistic changes when an orthogonal regressor is added, how many flat live trading days should make you doubt a backtest with a Sharpe ratio of 8, and which estimator minimizes expected absolute error. It tests regression mechanics, Sharpe-ratio scaling, and loss-function reasoning.
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