code: def standardize(self):
          
          self.covariates = self.datasource.covariate_data
          self.phenotypes = self.datasource.phenotype_data
docs: Standardize the variables within a range [-1.0 and 1.0]
  
          This replaces the local copies of this data. When it's time to
          scale back, use destandardize from the datasource for that.