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  1. #1
    Registered User
    Join Date
    05-20-2008
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    Need urgent help with interpolation on trendline

    hi, basicaly i have lets say an y axis with 1-100 and a y value of 16-36
    i need to use y value of 20 and go across to the trendline and find what the value of x is.
    thanks in advance

  2. #2
    Forum Guru Andy Pope's Avatar
    Join Date
    05-10-2004
    Location
    Essex, UK
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    10,944
    You can use formula to calculate the value based on the component parts of the formula.
    See here for more details
    http://people.stfx.ca/bliengme/ExcelTips/Polynomial.htm
    Cheers
    Andy
    www.andypope.info

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