Where do the SSN data values come from?
A data file is included with VOAProp containing monthly SSN data values from the year 1900 to the latest date available. This source of the data is this NOAA data file, however the data file VOAProp uses is in a different format and is downloaded from my web site. The VOAProp file is updated by me from the official one from time to time, and VOAProp will then pick it up when it checks for updates. I do not update VOAProp’s data file every time NOAA changes theirs (it gets tiresome after a while) so there may sometimes be small differences in the values. These differences make a negligible difference to the predictions.
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