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Excel 2010 Trendline With Data labels or number on forward forecast trendline

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    Angry Excel 2010 Trendline With Data labels or number on forward forecast trendline

    My data set is very simple... Its 7 months along the top and 7 amounts below. I create a basic line chart based on this data, click on the line and click to add a trendline. I select a logarithmic trendline and forecast it forward for 5 periods. But for the life of me I can't figure out how to get the bloody amounts excel is forecasting on the line. I need the actual numbers its forecasting. I've attached a spreadsheet. I don't care where the numbers show up (On the chart, in a table below the chart, completely outside the chart using formulas... don't care where, just need the actual numbers!!!) In a previous version of Excel (I think it was 2008) this was very simple and easy to do... I just had excel include the table with chart and bam, the numbers were there, but 2010 this appears to be problem.
    Attached Files Attached Files

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    Re: Excel 2010 Trendline With Data labels or number on forward forecast trendline

    You can't actually get the values of a trendline... What you can do is extract the formula and calculate the values yourself.

    1. Select the plotline
    2. Select Format
    3. Select "Display formula"

    from that you get Y = 2572.ln(x) + 43797

    In this case X is a series of values from 1 to 12
    Y values for each X then are =(2572 *LN(B7))+43797

    Where B7 is your first X value

    Once you've calculated your own Trend you can plot it as a second series and show the data.
    Elegant Simplicity............. Not Always

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    Re: Excel 2010 Trendline With Data labels or number on forward forecast trendline

    It took a bit for me to figure out how to get the formula to work right, but I got it. Thanks

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    Re: Excel 2010 Trendline With Data labels or number on forward forecast trendline

    Anytime.....

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    Re: Excel 2010 Trendline With Data labels or number on forward forecast trendline

    Hi,

    I'm having some trouble with converting the actual formula that Excel gave me- any chance you can help??

    y = 6E+07ln(x) - 1E+09

    thanks

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    Re: Excel 2010 Trendline With Data labels or number on forward forecast trendline

    You need to convert the scientific notation by using x 10 to the power, so for the first part you need to type in =6*10^7 (which is equivalent to 6E+07) and similarly for the other =-1*10^9. You can confirm that you get it right by formatting the cell that you input this into as "scientific" which then should get you back to the 6E+07.

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    Red face Excel 2010 Exponential Trendline help to use equation to get vaule for forward forecast

    sorry, have done.
    Last edited by rlbdurrant; 10-15-2015 at 09:10 AM. Reason: sorry

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    Re: Excel 2010 Trendline With Data labels or number on forward forecast trendline

    rlbdurrant: This forum is pretty strict about not posting your question in another user's thread. Start your own thread. If you feel that this thread would be valuable in explaining your question, provide a link to it.
    Quote Originally Posted by shg
    Mathematics is the native language of the natural world. Just trying to become literate.

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