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Proc Expand is quite useful for interpolating values, however sas help is not clear how it does when we want to spread the time series from a lower frequency (say year) to a higher frequency (say months), it sounds like it is making up data. Does anyone know it does? thanks.

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closed as off-topic by AdamO, Michael M, Michael Chernick, user158565, mdewey May 3 at 12:23

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I am just guessing BUT I would think they are fitting splines https://datascienceplus.com/cubic-and-smoothing-splines-in-r/ BUT that is just my guess .

It was a statistically educated guess ! and of course NO guess at all as I had never used that proc in SAS but have used cubic splines to resolve "missing non-existent values". but @whuber u r right ...web search reveals a lot .

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