2 papers
econ.EM2022
Causal Estimation of Position Bias in Recommender Systems Using Marketplace Instruments
Rina Friedberg, Karthik Rajkumar, Jialiang Mao +3
Information retrieval systems, such as online marketplaces, news feeds, and search engines, are ubiquitous in today's digital society. They facilitate information discovery by rank…
econ.EM2019
Ridge regularization for Mean Squared Error Reduction in Regression with Weak Instruments
Karthik Rajkumar
In this paper, I show that classic two-stage least squares (2SLS) estimates are highly unstable with weak instruments. I propose a ridge estimator (ridge IV) and show that it is as…