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Anniemaniac
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19 Oct 2007, 12:10 pm

I don't know if anyone else got something similar, but after I was given a diagnosis of Asperger's, a few weeks ago, I was given a report of my assessment. In it, there are a number of small charts, showing what tests I took, what my score was, and the percentile and I'm having trouble understanding what the Percentile means because he (the psychologist) never explained it.

The reason I'm asking is because the scores vary quite dramatically, and I have one particular score of "99th" that I'm curious about (I'm guessing that this percentile thingy goes from 1 to 100? which is why "99th" intrigues me, being so close to 100).

Does anyone understand these scores and can someone explain them to me?



shopaholic
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19 Oct 2007, 12:19 pm

It is to do with the scores of everyone who took the tests.

Imagine them arranged in a long line from the lowest to the highest.

You haven't said what particular test you are talking about, but if the ranges of scores were say between 3 and 197 out of 200, but 99% of people scored below 190, 190 would be the 99th percentile.

(Or it might be the other way around and go from high to low, e.g. 99% of people scored more than 10, so 10 would be the 99th percentile.)

If I understood what the specific tests were trying to measure, & your scores, I would be able to explain this a lot better!! !



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19 Oct 2007, 12:25 pm

shopaholic wrote:
(Or it might be the other way around and go from high to low, e.g. 99% of people scored more than 10, so 10 would be the 99th percentile.)

If I understood what the specific tests were trying to measure, & your scores, I would be able to explain this a lot better!! !


In that case, 10 would be the 1st percentile.

But I agree, there's no way to know what it means without knowing what the test was.



EvilKimEvil
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19 Oct 2007, 12:34 pm

Right, but 99th percentile is the highest percentile you can get, unless they are computing decile points, in which case the highest would be 99.9th percentile or 99.99th percentile, etc. I mean, if 100 people took the test and you're score was in the 99th percentile, that would mean that you got the highest score. If 1,000 people took the test, 99th percentile would mean that your score is one of the top ten scores. If you got the highest score out of 1,000 scores, you would be in the 99.9th percentile.



Anniemaniac
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19 Oct 2007, 1:25 pm

Well, he gave me a bunch of little tests, ranging from patterns and design recollection, to maths and language skills. The test I got 99th on was spelling.

The main reason I asked was because I got a little freaked out. The way my mind saw it was on a first to last basis, with 1st being the best, and 100th being the worst. So, when I saw "99th" I thought I'd come in "99th place" out of 100, so to speak, meaning I'd done very badly, but it seems that's not how it works...

It's all still a little confusing to me the way they do it :oops: but thanks for explaining it to me :)



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19 Oct 2007, 1:32 pm

Anniemaniac wrote:
Well, he gave me a bunch of little tests, ranging from patterns and design recollection, to maths and language skills. The test I got 99th on was spelling.

The main reason I asked was because I got a little freaked out. The way my mind saw it was on a first to last basis, with 1st being the best, and 100th being the worst. So, when I saw "99th" I thought I'd come in "99th place" out of 100, so to speak, meaning I'd done very badly, but it seems that's not how it works...

It's all still a little confusing to me the way they do it :oops: but thanks for explaining it to me :)


So what that test score means is that you are probably a very good speller, since on that test you performed better than 99% of people.



Anniemaniac
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19 Oct 2007, 1:47 pm

LostInSpace wrote:

So what that test score means is that you are probably a very good speller, since on that test you performed better than 99% of people.


Ok, Thank you :) So that would mean a score of 4th, would mean I was very bad at a particular test (quantitative reasoning, which I assume is maths)?

This is making a bit more sense now, since I'm hopeless at maths, so 4th would be accurate if it means I did badly.



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19 Oct 2007, 4:07 pm

Anniemaniac wrote:
LostInSpace wrote:

So what that test score means is that you are probably a very good speller, since on that test you performed better than 99% of people.


Ok, Thank you :) So that would mean a score of 4th, would mean I was very bad at a particular test (quantitative reasoning, which I assume is maths)?

This is making a bit more sense now, since I'm hopeless at maths, so 4th would be accurate if it means I did badly.


Yes. Obviously I'm not familiar with the particulars of the test you took, but generally a score in the 4th percentile would fall into the range of impairment, or at least low ability, as it is more than one standard deviation below the mean. It's certainly below average. The range of percentile scores considered to be within the average range are generally the 16th to the 84th percentiles.



Anniemaniac
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19 Oct 2007, 5:33 pm

Ok, thank you again for your help :)