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Vincent, one way bumpiness might be interpreted...

from a practitioner's perspective, is that it is a measure of noise, a detector of outliers that may show up as unaccounted-for noise, from the way, say, a process is producing the data, even a data-entry process, or some other force or process/system giving rise to that (those) particular noise(s). Yes?

So the thing would be try various tactics for reducing bumpiness, maybe by screening those outliers, etc., and even running a TSA on the residuals after factoring or "partialing out" the bumpiness. 

But isn't that part of whitening? An SOP in Box-Jenkins Analysis or old ARIMA models?

Help me understand this.

Thanks

Bill Luker

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Comment by Vincent Granville on April 30, 2013 at 6:41pm

Hi Bill, see my answer (posted as a comment) here.

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