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Thread: Formula Help

  1. #1
    Moderator VBAX Master austenr's Avatar
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    Formula Help

    I usually try to do this kind of thing in Tableau or Power BI but am forced to try to do it in Excel 2013.

    Trying to do a forecast for calls for month of March. Using the following formula produces results that I think are unrealistic:

    In E59
    =forecast(A59,$C$2:$C$58,$A$2:$A$58)
    Returns 32.67881
    Copying that formula down the result varies from 32 to 33 with fractions.
    Was expecting some more variances based on the data.

    Anyone have any ideas?

    Workbook attached.
    Peace of mind is found in some of the strangest places.

  2. #2
    VBAX Sage
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    FWIW, your data is pretty erratic and seems to vary by DOW

    Capture.JPG

    You could

    1. Use a 30 a moving average (see attachment)

    or

    2. Do 7 different forecasts (one for each DOW) separating inputs by day of week
    Attached Files Attached Files
    ---------------------------------------------------------------------------------------------------------------------

    Paul


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  3. #3
    Moderator VBAX Sage SamT's Avatar
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    Day of Week affects calls.

    Month of year also affects calls, as do holidays and general public attitudes. For example all calls and sales are up this year compared to last march due to the so called 'Trump Effect' on Society's attitude.
    I expect the student to do their homework and find all the errrors I leeve in.


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  4. #4
    VBAX Sage
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    I separated the input data by DOW, and just the input DOW data to FORECAST the 'output'

    Capture.JPG

    Still don't know how statistically valid any of this is
    Attached Files Attached Files
    ---------------------------------------------------------------------------------------------------------------------

    Paul


    Remember: Tell us WHAT you want to do, not HOW you think you want to do it

    1. Use [CODE] ....[/CODE ] Tags for readability
    [CODE]PasteYourCodeHere[/CODE ] -- (or paste your code, select it, click [#] button)
    2. Upload an example
    Go Advanced / Attachments - Manage Attachments / Add Files / Select Files / Select the file(s) / Upload Files / Done
    3. Mark the thread as [Solved] when you have an answer
    Thread Tools (on the top right corner, above the first message)
    4. Read the Forum FAQ, especially the part about cross-posting in other forums
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  5. #5
    Moderator VBAX Master austenr's Avatar
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    Thanks guys. Yea the data is totally bogus just generated some random value between 1 and whatever for something to play with. What they want is looking at how calls are trending compared in a bar chart with a poly trend.

    This would be so much easier to do with excel 2016. All or a lot of this is built in.
    Peace of mind is found in some of the strangest places.

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