OECD Adult education level data analysis 8 - Making panel data frame using R plm package

UnsplashのDaniel Pelaez Duqueが撮影した写真 www.crosshyou.info This post is following of the above post. In the previous post, I did regression analysis with time-series data. Unfortunately, I cannot make a statistically significant model. Now, I will make panel data in this post. First, let's chec…