I do use R and I'm working on getting better with it. I need to get better at pulling data off websites likes ET. I'm sure there is a package on R that makes it easy. That sentiment indicator could be really nice.
Here is a great into into using rvest and SelectorGadget in R to scrape data from web pages.
I also use the XML package for web scraping tables from websites. For example I have wrote a function so that R scrapes all the tickers of constituents in the S&P 500 and then saves it to .txt file. I can then use that ticker list to download data only for those particular tickers.
R has tons of uses and is designed with big data in mind. In fact its very hard to find something that R does not do

This is a good book for getting started.
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