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Finding a Specific Value using Non Linear Data

  1. 10-18-2011, 11:51 AM #1
    MINE
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    Finding a Specific Value using Non Linear Data

    I have a fairly simple problem. I have some x and y values...I can plot a graph, but can't get the exact point I'm looking for.

    The data is non-linear so the FORECAST function does not work. Can someone put in the right formula for me? Please see attached.


    Thanks
    Attached Files Attached Files
    Last edited by MINE; 10-18-2011 at 02:10 PM.
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  2. 10-18-2011, 01:07 PM #2
    FloMM2
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    Re: How can I get this?

    MINE,
    I got 35.2488. I plotted the points, added trendline, use a polynomial (3), display formula on graph.
    hth
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  3. 10-18-2011, 01:57 PM #3
    shg
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    Re: Finding a Specific Value using Non Linear Data 

    Please Login or Register  to view this content.
    The formula in B11 is

    =PERCENTILE(B2:B9, PERCENTRANK(C2:C9, C11))

    It works because y is monotone ascending in x. If it were monotone descending, you could use

    =PERCENTILE(B2:B9, 1- PERCENTRANK(C2:C9, C11))

    If it were neither, you'd need a different approach.
    Entia non sunt multiplicanda sine necessitate
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  4. 10-18-2011, 02:09 PM #4
    MINE
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    Re: Finding a Specific Value using Non Linear Data

    Great, the answer is indeed 38.3...I just couldn't figure out how to get it done in Excel. Thanks Alot.
    Last edited by shg; 10-18-2011 at 03:26 PM. Reason: deleted quote
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