Parameter Estimation and Evaluation Empirical Studies and Statistical Inference Empirical Studies and Statistical Inference Various data imperfections may arise in practice,such as: multicolinearity or near-multicolinearity; conditional heteroskekasticity and autocorrelation in error terms; censored data; truncated data; contaiminated data; errors in variables; -missing observations; endogeneity; curse of dimensionality; weak instruments; unobserved counterfactuals; partial identification,and etc. Big Data,Machine Learning and Statistics Introduction to Statistics and Econometrics Juy8,2020 11/70Parameter Estimation and Evaluation Big Data, Machine Learning and Statistics Introduction to Statistics and Econometrics July 8, 2020 11/70 Empirical Studies and Statistical Inference Empirical Studies and Statistical Inference