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How/Who are you compared with for your percentile rank

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How/Who are you compared with for your percentile rank [#permalink]

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New post 06 Jan 2010, 15:28
I hope someone can help me with this question. How how does ETS rank and with whom do they rank test takers with to come up with a test takers percentile score. Does ETS compare scores of people who took tests that day or from that week? I am thinking if you understand how and when the rankings are developed. You could game plan around it. For rexample if scores are of people who are compared in a given 24 hour period then take the test on a day where the lowest number of people take the test, say a Monday. So if you score high then feasibly your percentile ranking may be higher than normal because of the smaller pool of test takers. Just a thought. Comments, answers, feedback?
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Re: How/Who are you compared with for your percentile rank [#permalink]

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New post 06 Jan 2010, 22:02
i'm pretty sure they calculate percentile rank per 'block' of time period (i.e. per a 2 year period). it's the reason why some people with slightly older scores have different percentile ranks than people who recently took it (say, a 750 back in 2007 was a 99th percentile, but today a 750 would be a 98th). i don't think it changes within that block of time (so if you took it on a monday, or a thursday, your score and percentile wouldnt change).
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Re: How/Who are you compared with for your percentile rank [#permalink]

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New post 06 Jan 2010, 22:32
ETS/GMAC creates a scale and then applies it to everyone. That scale is revised every year or two.
They cannot do it on a more regular basis for a number of reasons (fluctuation of percentiles is one of them, but there are others). We've realized this when created gmat club tests - we update our percentiles annually or semi-annually and sometimes it pushes people one way or another.
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Re: How/Who are you compared with for your percentile rank   [#permalink] 06 Jan 2010, 22:32
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