checkDEMIExperiment_normalization: Checks if normormalization is correct
Description
Checks if normalization is correct for the DEMI analysis. 'normalization' stands for
normalization method or 'norm.method' in the DEMIExperiment object. It is used internally
in DEMI analysis.
Usage
checkDEMIExperiment_normalization(normalization)
Value
Returns NULL if normalization is ok, else returns an error message.