On Thu, 16 Dec 2021, Jim Lemon wrote:
From what you sent, it seems like you want to find where the change in _measurement interval_ occurred. That looks to me as though it is the first datetime in each row. In the first row, there is a week gap between the ten and fifteen minute intervals. This may indicate that no measurements were taken or perhaps they were lost.
Jim, Yes, there are times when the equipment fails, but not all changes in measurement intervals have a time gap other than a few minutes. Normally I work with much smaller data sets so if there are interval changes they've not appeared in the data I've used. I will learn from the USGS why there are so many measurement interval changes. Because these data are so different from what I've seen in the past I want to explore whether (or how) they affect discharge variability calculations. Regards, Rich ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
