Normal SD calculations applied to a range of VWAP values yield results like .04 which are pointless. I've seen pics posted where the VWAP has SDs graphed along with it and they are a meaningful distance away on both sides, like a few points or whatever. HOwever these charts never explained how they were doing it. I've seen a lot of discussions on forums about calculating the standard deviation of the VWAP and it seems a lot of people are having this same issue. So do any ETers know the secret? What am I doing wrong?