The article “5 Ways to detect Outlier” written by Will Badr demonstrates 5 different methods to detect outliers. The methods and corresponding code is written in Python but similar packages are available in R that allows us to reproduce this analysis in R.
The second article worth reading is “Strategies for working with new data” by Sharla Gelfand. The article provides code in R and explains some strategies one can implement with new data.
Atmajit Gohil 
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