Qingchuan LyuinTowards Data ScienceUnderstanding Normal DistributionIn this post, we’ll walk through the basic concepts , properties, and practical values of Normal distribution. If you want to discuss…8 min read·Feb 4, 2021----
Qingchuan LyuinTowards Data ScienceImplementing Random ForestIn this post, we’ll walk through basic concepts behind Random Forest, discuss practical problems of implementation, such as highly…7 min read·Jan 26, 2021--1--1
Qingchuan LyuRedoing Projects — Part III: NLPThis post is part of efforts on improving my technical projects by redoing them. Each post describes how I identified suspicious spots and…5 min read·Jan 10, 2021----
Qingchuan LyuRedoing Projects — Part II: Time Series (Sales)This post is part of efforts on improving my technical projects by redoing them. Each post describes how I identified suspicious spots and…6 min read·Dec 25, 2020----
Qingchuan LyuRedoing Projects — Part I: RegressorsIn this post, I discuss how my previous feature engineering and modeling methods didn’t work and how I corrected them. This post is the…5 min read·Dec 20, 2020----
Qingchuan LyuinAnalytics VidhyaUnderstanding Linear Regression AssumptionsIn this post, I’ll show you two necessary assumptions for linear regression coefficient estimates to be unbiased, and discuss other “nice…5 min read·Nov 28, 2020--1--1
Qingchuan LyuinAnalytics VidhyaPython: Data manipulation and simulationIn this post, we’ll walk through basic techniques of data manipulation and simulation with Python.3 min read·Oct 28, 2020----
Qingchuan LyuPower and Level in A/B TestIn this post, we’ll learn what is power, significant level, type I/II errors and how they relate to each other.2 min read·Oct 26, 2020----
Qingchuan LyuSimple explanation of p-valueJust wanted to explain p-value in a very simple way.2 min read·Oct 23, 2020----