Practice a useful step in working with high-dimensional data - removing invariant columns

SNP data are often stored in VCF files. These files organize SNPs in rows and samples (e.g. people) in columns. For analysis in R, the data, therefore, need to be converted into the correct form.

This checkpoint introduces the process of setting a working directory and loading data into R.

This script covers the basic details of doing PCA in R.

Getting started with RPubs.