Top Citadel Securities Quant Interview Questions and Answers
In this article, we will explore some commonly asked quant interview questions from Citadel Securities and provide detailed solutions and explanations. By mastering these concepts, you'll be better prepared to tackle the real interview with confidence.
Ridge regression is a type of regularized linear regression that introduces a penalty term to the loss function in order to prevent overfitting and handle multicollinearity among features. The standard linear regression estimates coefficients by minimizing the residual sum of squares:
$$ \text{RSS}(\beta) = \| y - X\beta \|^2 $$
