Based on total 13000 Fairfax second graders, give or take.

Two total different 99 percentiles here, ppl.
One is the NNAT, which sampled against nationwide data. 98 percentile nationwide NNAT is about 80 to 85 percentile in Fairfax county, so 99 percentile nationwide might very well be 90 to 95 percentile Fairfax county, which results in 650 to 1300 kids.
As for the new Fairfax CogAT, it's sampled against Faitfax kids only, so only 130 kids 99 percentile CogAT.
Look up in the threads, you can see amny claimed NNAT 99%, but not many 99% CogAT.

Anonymous wrote:

Anonymous wrote:Considering the cogat is only represented by fcps kids, with 12000 kids taking the test, there are 120 in the 99 percentile. Simple as that.

PP here. Not sure that's true. Admittedly know very little about the cogat, but my quick research suggests it is nor end against more than just the FCPS student body. In which case it is entirely possible that more than 1% of FCPS students score in the 99% of the test. In fact, to go back to my earlier point about regional demographics being skewed toward the higher percentile a on just these types of measures, I would in fact be shocked if it were only 1% of kids.

''

This is a very transient area.

Most people choose to live here because of the schools. Many coming in from out of state choose fcps specifically for the extensive gifted program. It stands to reason that with so many more people moving into this area for the schools, you are going to have a higher number of exceptionally well scoring kids than an area that is not so transient (and whose transients are not so educated)

Most areas of the country do not have the steady, yearly influx of new residents who are highly educated with higher socioeconomic status.

Anonymous wrote:

Anonymous wrote:Considering the cogat is only represented by fcps kids, with 12000 kids taking the test, there are 120 in the 99 percentile. Simple as that.

I don't think the percentile ranking is a measurement against other students in FCPS, is it? I thought it was more like a comparison to a much larger sample, i.e. a statewide population?

This year's cogat was normed locally, using only FCPS second graders.
For example, if they had only given the test to 100 kids, the top kid would be the only one to get 99th percentile score.

The fairfax version FAT of cogat was only scored on percentile based on Fairfax county kids only. It says it on the letter that was sent out with the scores.

I've been puzzling over this:

Are we just a hugely self-selected sample, are a lot of people lying, or are some people sock-puppeting on the test scores? Or is there something else going on? Because by definition it doesn't seem like there would be that many 99th percentilers running around?

I suspect it speaks to the demographics of this site than the other scenarios. But I've always been puzzled by this when I read the scores posted here.

They are mostly liars - endemic to the DC area.

Anonymous wrote:Considering the cogat is only represented by fcps kids, with 12000 kids taking the test, there are 120 in the 99 percentile. Simple as that.

I don't think the percentile ranking is a measurement against other students in FCPS, is it? I thought it was more like a comparison to a much larger sample, i.e. a statewide population?

And sorry for all the typos. 'Nor end' = normed, 'percentile a' = percentiles. Sure there are more.

Anonymous wrote:Considering the cogat is only represented by fcps kids, with 12000 kids taking the test, there are 120 in the 99 percentile. Simple as that.

PP here. Not sure that's true. Admittedly know very little about the cogat, but my quick research suggests it is nor end against more than just the FCPS student body. In which case it is entirely possible that more than 1% of FCPS students score in the 99% of the test. In fact, to go back to my earlier point about regional demographics being skewed toward the higher percentile a on just these types of measures, I would in fact be shocked if it were only 1% of kids.

Considering the cogat is only represented by fcps kids, with 12000 kids taking the test, there are 120 in the 99 percentile. Simple as that.

I'm guessing it's the combo of area demographics (I'd stake money on the hypothesis that the DC demographics skew higher for norm based performance testing) and DCUM demographics, along with the tendency for folks to be more likely to post when they/their kids are successful (see the HHI threads for another example of this.)

Wait for the SOL scores -- then all the "my Snowflake scored a perfect 600 and is not in AAP" posts fill up here.

LOL. So true, PP!

Sock puppet, bragging, exaggerating. Wait until you see the kids that are in AAP. Not all so high IQ!

I've been puzzling over this:

Are we just a hugely self-selected sample, are a lot of people lying, or are some people sock-puppeting on the test scores? Or is there something else going on? Because by definition it doesn't seem like there would be that many 99th percentilers running around?

I suspect it speaks to the demographics of this site than the other scenarios. But I've always been puzzled by this when I read the scores posted here.