I just worked on the food export data of the world and made some visualizations via Excel. Here are the food export share 2020 for...

Does higher wage necessarily lead to inflation? Here is a presentation for this: Chinese video version： https://www.bilibili.com/video/BV...

Thanks for the following blog, which teaches me how to extract nightlight data from .tif file in R: https://berenger.baospace.com/nightli...

Intuition The target value for each ListNode equals sum(for i,j in enumerate(list): j*10^i). After adding two values, we can create and...

This is a solution for one of the leetcode problems Intuition For each time the combination of IV appears, for example, if we add up I...

In the context of Capital Marx, according to the labor theory of value, the value of a commodity comprises of the value of constant...

In machine learning, the standardization of data is crucial, because most machine learning algorithms are sensitive to the scale of data....

This is a post about some caveats on calculating mean value in R: 1. If a vector contains NA value, then mean(vector) always returns NA...

Here are my data visualization works on the rice export data 2020, and the data source is : https://www.fao.org/faostat/en/#data/TCL...

As we know, the power of a test is the probability of given H1 being true, and rejecting H0. Usually, we do not know exactly the power of...

Given such a basic setting (a setting that appeared in my Research Module of Econometrics and Statistics): Here sigma_hat is a biased...

Here is my note about how to use git, edited by LaTex This note will be updated with new content sometimes. Find LaTex code from here:...

Here we compare the shrinkage path of Ridge and Lasso regression, here the shrinkage path refers to the different coefficients of...

In this post, I will compare the performance of PCA, Lasso, and Ridge regression at a relatively high dimensional DGP. Number of...

This is my final project for the course Computational Statistics, the file is attached.

Tax is not the revenue of government: Function of Tax in the perspective of Modern Money Theory (MMT) This blog is based on the idea of...

In this blog, I will show omitted variable bias in an intuitive way. Omitted Variable Bias (OVB) means that in a regression, the...

Triple difference is an extended version of Difference-in-Difference, and it also requires common trend assumption, but according to...

This post is aming to provide a intuitive explanation on the Institutional Economics course, taught by Prof. Dr. Eva Hoppe, University of...

Principal Component Regression is a regression that uses Principal Components Analysis to select M principal components, and uses these...