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This does help, thank you for the assistance.

Thanks for this method, it works very well. I just wish there was some inherent way to calculate this directly. The workfile I am working with has about 2000 series in it and having to create an intermediary series for each just clutters things up a bit.

Is it possible to convert data from monthly frequency to annual frequency, but employing a weighted average rather than just a simple straight average of the twelve values? If not, is there some kind of workaround that is possible? The root of my problem is that I need to calculate an annual average...