PinnedJiayang NieHow to Explain Bais-Variance Trade-off in a Statistic WayBias-Variance Trade-off is usually used to explain accuracy v.s. overfitting tradeoff. However, it is not rigorous and difficult to…Aug 2, 2022Aug 2, 2022

PinnedJiayang NieHow does R solve linear regression?Let’s first think of an interesting example.Aug 12, 20221Aug 12, 20221

PinnedJiayang NieWhat are the assumptions for linear regression and how to solve mis-specification?LinearityJun 25, 2022Jun 25, 2022

Jiayang NieK-Means Clustering is a special version of Gaussian Mixture ModelsK-means clustering is a simple algorithm for cluster data points in unsupervised learning. Well, it can be argued to be seen as…Jul 25, 20221Jul 25, 20221

Jiayang NieFeature Engineering: Common Methods to Select Features with Pros and ConsData VisualizationJun 25, 2022Jun 25, 2022

Jiayang NieWhat to do when there exists spill-over effect in your ab-testing?A/B testing is a powerful decision-making tool. However, if social network spill-over effect exists, then the average treatment effect will…May 27, 2022May 27, 2022

Jiayang NieWhy does the degrees of freedom in Linear Regression equal n-p?If we run linear regression in R, then we will see a term in the report “degrees of freedom” and that value equals n-p where n is the…May 26, 2022May 26, 2022