I am comparing two RMS error time-series and I would like to generate error bars on the RMS results. I think the RMS error is a standard deviation of an assumed zero mean process, and I have the gut feeling that this should be the standard deviation of the sample standard deviation. Is that correct? I would like to have a reference to cite on a paper I am writing at the moment, so if anyone knows of a useful reference I would appreciate some pointers. Thanks in advance.