The RNA-seq data from TCGA contain the Z-SCORE, instead of RPKM values. I wanted to perform analysis of TCGA data and GTEx data. But the problem is GTEx data contains RPKM and counts values. There is a tutorial explaining the Z-score calculation (http://dept.stat.lsa.umich.edu/~kshedden/Python-Workshop/gene_expression_comparison.html), but i am not sure it works for RNA-seq or it is the correct tutorial.
Can someone please guide me how to calculate the z-score of genes using GTEx RNA-seq data (RPKM and count data). If possible verify the above link, is it correct code.