File:IQ curve.svg
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| Bayin | Current IQ tests typically have standard scores such that the mean score is 100 with each standard deviation from the mean counting for 15 IQ points.[1] The plot shows, assuming that such scores have a normal distribution, the percentage of people getting a score versus the score itself, from 55 to 145 IQ, that is over a span of six standard deviations. Spans are represented with different colors for each standard deviation above or below the mean. The plot was created with the following gnuplot code: |
| SVG genesis | |
| Source code | Gnuplot codeset terminal svg name 'IQ_curve' size 600,480 font ',10' rounded
set output 'IQ_curve.svg'
mu = 100.0
sigma = 15.0
from = 55
to = 145
# Normal distribution:
# (continuos normalization approximation, good to ~10 digits in this case)
P(x) = exp(-(x - mu)**2 / (2 * sigma**2)) / (sqrt(2 * pi) * sigma) * 100
# By sigma intervals:
oddsi(x) = (int(abs(x - mu) / sigma) % 2) ^ (x < mu)
Pm(x) = (x == mu) ? P(x) : 1/0 # sample at mu
Po(x) = ( oddsi(x) && (x != mu)) ? P(x) : 1/0 # samples in odd sigma intervals
Pe(x) = (!oddsi(x) && (x != mu)) ? P(x) : 1/0 # samples in even sigma intervals
set key off
set border 3
set xlabel 'IQ'
set xtics 10 out nomirror
set mxtics 2
set ylabel 'Population, %'
set ytics 1 out nomirror
set mytics 2
set samples (to - from + 1)
set style function impulses
plot [x = from:to] \
Pm(x) lw 2, \
Po(x) lw 2, \
Pe(x) lw 2
|
| Kaü kentaü be | |
| Usulu | Cida kaanum |
| Ruoma | Alessio Damato, Mikhail Ryazanov |
- ↑ Kaufman, A.S. (2009) IQ Testing 101, New York (NY): Springer Publishing, pp. 104−109 ISBN: 978-0-8261-0629-2.
Lasisi yo
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Nyiro izini sadena gone, samne kuru/aw Document adǝ falle cidiya sharadu awo Izni GNU bǝ deye, Luwo 1.2 aw luwo gadǝ huwu bǝ sulin ma karafka sofware deye yo ye; sashi faltǝ ba, ruwo fuwu yǝ bawo, kuru ruwo ngawo yǝ bawo . Jiri izni bǝ dǝ suro sashi bǝ dǝn bǝji GNU izni Documentation bǝ. |
  
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This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license. | |
same or compatible license as the original. | ||
| This licensing tag was added to this file as part of the GFDL licensing update. |
This file is licensed under the Creative Commons Attribution-Share Alike 2.5 Generic, 2.0 Generic and 1.0 Generic license.
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| Kentawu/luktu | Thumbnail | Nakkaa nguwu | Faidatema | Mana | |
|---|---|---|---|---|---|
| kərma | 23:11, 26 Jumada auwal 2020 | | 600 × 480 (9 KB) | Paranaja | Reverted to version as of 21:27, 2 November 2012 (UTC) |
| 21:27, 2 Jumada auwal 2012 |  | 600 × 480 (9 KB) | Mikhail Ryazanov | IQ values are now integers; gnuplot-only approach | |
| 09:20, 6 Jimada gaji 2006 |  | 600 × 480 (12 KB) | Alejo2083 | {{Information |Description= The IQ test is made so that most of the people will score 100 and the distribution will have the shape of a Gaussian function, with a standard deviation of 15. The plot shows the percentage of people getting a score versus the |
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