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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Pete Dalgaard's Introductory Statistics with R is a good book, but not free online as far as I know.[1]
Or go to the source with An Introduction to R[2][3]
I also enjoyed Norm Matloff's fasteR tutorial.[4]
[1] https://www.springer.com/gp/book/9780387790534
[2] https://cran.r-project.org/doc/manuals/r-release/R-intro.pdf
[3] https://intro2r.com/the-aim-of-this-book.html
[4] https://github.com/matloff/fasteR
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