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Formula for a Line given data set

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    Formula for a Line given data set

    Im trying to come up with a polynomial formula for given x's and y's. Im using the linest and index functions, but can seem to get it to work.

    see attached.

    thank you
    Attached Files Attached Files

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    Re: Formula for a Line given data set

    You have several blank cells in your input range to the LINEST() function. You also have more Y values than you have X values. Unlike most other Excel functions that can ignore blank cells, LINEST() cannot work with blank cells, so you need to remove those blank cells from the input range. I am not sure exactly what those blank cells represent, so I am not sure what to recommend. I do note that, if I change the input ranges to B3:B1116 (known_y) and A3:A1116 (known_x), because that matches the range of entered values for the x values, that the formula you have works just fine.
    Quote Originally Posted by shg
    Mathematics is the native language of the natural world. Just trying to become literate.

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    Re: Formula for a Line given data set

    The formula works up to 3282. That's how many Y values are there.
    After that both X and Y columns are empty and it doesn't work.
    Also, Index function doesn't do anything. With or without Index, the formula results in -1.23145.
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    Modytrane

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    Re: Formula for a Line given data set

    Had no idea the formula couldn't work with empty cells.
    Once i made that change everything started working.

    Thanks!

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