R

I recently used R for a moderately complicated scraping task, and found that using tools and techniques from the tidyverse made for a very pleasant web scraping experience, especially for retrieving nested data.

Let’s walk through some steps for web scraping with R. On this Wikipedia page there is a table of visa requirements that I want to scrape. Let’s use the rvest package to get the HTML associated with that page:

A simulation for OLS model In an observational study, we need to assume we have the functional form to get causal effect estimated correctly, in addtion to the assumption of treatment being exogenous.