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…Feb 4, 2021Feb 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…Jan 26, 20211Jan 26, 20211
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…Jan 10, 2021Jan 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…Dec 25, 2020Dec 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…Dec 20, 2020Dec 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…Nov 28, 20201Nov 28, 20201
Qingchuan LyuinAnalytics VidhyaPython: Data manipulation and simulationIn this post, we’ll walk through basic techniques of data manipulation and simulation with Python.Oct 28, 2020Oct 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.Oct 26, 2020Oct 26, 2020
Qingchuan LyuSimple explanation of p-valueJust wanted to explain p-value in a very simple way.Oct 23, 2020Oct 23, 2020
