I would also go for ========= stdize Output: same as input Arguments: X (matrix or list) dfcorr (integer, optional) dfcorr = 0 (MLE) dfcorr = 1 (sample standard deviation) dfcorr = k > 1 (other) dfcorr = -1 -> centering only ================= with default k=1. Excellent. Help remark: "Returns the standardized version of the data contained in X, scaling each series/column by the sample standard deviation (dfcorr = 1 by default). For dfcorr = -1 each series/column is centered around its sample mean (no scaling) PS = What about inserting it in the menu? (Add) Yiannis