File:IQ curve.svg

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Mutsananguro 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:
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Source code
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Gnuplot code

set 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
Musi
Mabviro Basa rangu
Munyori Alessio Damato, Mikhail Ryazanov
  1. Kaufman, A.S. (2009) IQ Testing 101, New York (NY): Springer Publishing, pp. 104−109 ISBN: 978-0-8261-0629-2.

Kurezinesa

I, the copyright holder of this work, hereby publish it under the following licenses:
GNU head Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled GNU Free Documentation License.
w:en:Creative Commons
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This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license.
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  • kugova – kucheza, kugovera ne kutumira basa
  • kurhimikisa – kugadzirisa basa
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  • Uzikano – Unofanhira kupa kiredhiti yakakodzeka, ipa kochekero yekune rezinesi, uye ratidza kana zvichinjirudzo zvaitwa. Ita sokudaro zviichienderana nenzira inonzwisisika, asi kwete nenzira ingaratidze zvekudii kuti murezinesi anokutsigira kana kushandiso kwako.
  • gova saizvo – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.
This licensing tag was added to this file as part of the GFDL licensing update.
w:en:Creative Commons
Uzikano gova saizvo
This file is licensed under the Creative Commons Attribution-Share Alike 2.5 Generic, 2.0 Generic and 1.0 Generic license.
Wakasungunuka:
  • kugova – kucheza, kugovera ne kutumira basa
  • kurhimikisa – kugadzirisa basa
Pasi pemamiriro anotevera:
  • Uzikano – Unofanhira kupa kiredhiti yakakodzeka, ipa kochekero yekune rezinesi, uye ratidza kana zvichinjirudzo zvaitwa. Ita sokudaro zviichienderana nenzira inonzwisisika, asi kwete nenzira ingaratidze zvekudii kuti murezinesi anokutsigira kana kushandiso kwako.
  • gova saizvo – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.
Unokwanisa kusarura rezinesi inoenderana nezvaunoda.

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parizvino23:11, 26 Mbudzi 2020Mfananoudoko weuhlovo sekubva 23:11, 26 Mbudzi 2020600 × 480 (9 KB)ParanajaReverted to version as of 21:27, 2 November 2012 (UTC)
21:27, 2 Mbudzi 2012Mfananoudoko weuhlovo sekubva 21:27, 2 Mbudzi 2012600 × 480 (9 KB)Mikhail RyazanovIQ values are now integers; gnuplot-only approach
09:20, 6 Zvita 2006Mfananoudoko weuhlovo sekubva 09:20, 6 Zvita 2006600 × 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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