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How to assign/match percentiles to my data from an original data set's percentiles

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    How to assign/match percentiles to my data from an original data set's percentiles

    I have one data set (Benchmark Results) with a corresponding percentile for each number. I have a second data set (My Results) and I want to see where they fall in relation to the original set.

    How should I proceed?

    Thank you.

    percentile ranking.xlsx

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    Forum Guru benishiryo's Avatar
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    Re: How to assign/match percentiles to my data from an original data set's percentiles

    welcome to the forum, pwwexcel. you didnt state what you wish to see in column F. that will help us understand better. i'm guessin F2:
    =LOOKUP(E2,$C$2:$C$11,$B$2:$B$11)

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    Forum Moderator Glenn Kennedy's Avatar
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    Re: How to assign/match percentiles to my data from an original data set's percentiles

    I looked at Benishiryo's solution. However, it gives 90% for the first value (i.e. it's rounding percentiles UP), whereas I would have thought that it should have returned 80%. See the alternative (attached).
    Attached Files Attached Files
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    Re: How to assign/match percentiles to my data from an original data set's percentiles

    Thank you, Benishiryo and Glenn! Yes, the first value should actually be around 85.6%, as it is between 7.00 and 7.22. But Benishiryo's formula rounds the number to nearest 10th decimal place.

    Is it possible to make it more accurate by giving the solution number a 1000th decimal place (0.856, for example)?

    Thanks, again!

    Paul

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    Forum Moderator Glenn Kennedy's Avatar
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    Re: How to assign/match percentiles to my data from an original data set's percentiles

    Hi there. Sorry for the delay. I was taking apart an old wooden box, to salvage timber... Both solutions above - either rounding up (benishiryo) or down (me) the percentiles would only ever classify your results into a RANGE (i.e 80-85. or whatever. it sounds like you want an estimate of the percentile, rather than a range. So I have had a go at this for you. I've fitted your data to a 3rd order polynomial & used LINEST to calculate the regression parameters. Any data outside the range of the benchmark are invalid - you've no idea what happens there...

    take a look & let me know...
    Attached Files Attached Files

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    Re: How to assign/match percentiles to my data from an original data set's percentiles

    Hi Glen, thank you! That's what I needed.

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    Forum Moderator Glenn Kennedy's Avatar
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    Re: How to assign/match percentiles to my data from an original data set's percentiles

    OK, you're welcome.. Can you please mark the thread as solved and (preferably) say thanks to all who helped by clicking the Add Reputation button at the foot of their post(s).

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