I am learning the analysis of TCGA data. I realized I can get 3 kinds of RNA expression level information, raw count, scaled estimates(TPM) and upper quartile normalized RSEM count estimates. I am confused that which kind of data I shoud choose. For example, if I want to explore the correlation between RNA expression and clinical feature, which kind of data should be choosed? What can upper quartile normalized RSEM count estimates and scaled estimates(TPM) be used for respectively? Thank you!