I have rna-seq data for whole genome. I want to extract whole blood tissue columns and GBR population samples only. The file has many samples from different populations as well as different tissues count data.
I don't understand how to do this?
It would help that you state the source of the data. By GBR, I presume that you mean 'Great Britain', i.e., the island of Great Britain, which comprises the nation states of England, Scotland, and Wales. There should be some associated metadata with your dataset, which likely has this information, and also the information on which samples are whole blood tissue.