I don’t understand you question then. In the helpfile, test code, you get -103 for a sinewave (very low flatness) and -1.5 for white noise (very high flatness) - this is in line with the definition Gerard points at. Flipping the numbers will make it wrong. The way to get it positive would be to add 110. that way you sine would have a very low positive number, and your noise a very high positive number. I don’t know what you get though.