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(Topic ID: 80658)

Some analysis of IFPA Ratings

By appeac

10 years ago



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  • 2 posts
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  • Latest reply 10 years ago by Zaxxis
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    #1 10 years ago
    OP
     
    ADM

    appeac

    Inactive member

    US Grand Rapids, MI

    11y 32,900 306 1 13

    Just messing around wondering where my rating ranked, posting here to share with anyone interested.

    I pulled all 16140 players from the IFPA website,

    Mean: 1130.62783
    Median: 1116.83
    St Dev: 218.5375349

    Histogram with bin size 50 here:
    http://i.imgur.com/5GCw7um.png

    Not sure what the reason is for the spike between 800-900, any guesses welcome. Besides that, it seems to be a fairly normal distribution, which it is supposed to be.

    To calculate your percentile score (my whole reason for doing this), find your z-score

    zscore = (yourrating-1130.62783)/218.5375349

    and enter it here
    https://www.measuringusability.com/pcalcz.php

    under "one-sided"

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    #2 10 years ago
     
    BRI

    Zaxxis

    Pinside member

    19y 67,400 414

    OP
    Quoted from appeac:

    http://i.imgur.com/5GCw7um.png
    Not sure what the reason is for the spike between 800-900, any guesses welcome. Besides that, it seems to be a fairly normal distribution, which it is supposed to be.

    My guess it's because not every player rating is visible. Off the top of my head, you must have played in 5 events for the ratings to be visible on ranking page. Given that most players who attended one event most likely didn't do well, they most likely have low ratings.

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