 Data transformation (statistics)

In statistics, data transformation is the application of a deterministic mathematical function to each point in a data set—that is, each data point "zi" is replaced with the transformed value "yi" = "f"("zi"), where "f" is a function.Transforms are usually applied so that the data appear to more closely meet the assumptions of a statistical inference procedure that is to be applied, or to improve the interpretability or appearance of graphs.