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« Bad Roads Cost Me Over $400 Per Year | Main | Free Money Finance March Madness, Final 32, Posts 29-32 »

March 13, 2008


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It should be noted that, once you've input the first set of formulas (one row in columns 4-7) into Excel or a similar spreadsheet, you can grab the corner of the cells and drag them downward and the formulas will automatically fill in.

What about a WMA (weighted moving average), or EWMA (exponentially-weighted moving average)? See: This applies weights to more recent months, allowing trends in spending (both good and bad) to show up more quickly and with more impact.

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