Restren:IQ curve.svg

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Deskrifans 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
Dedhyans
Pennfenten Ober honan
Awtour 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.

Leshyans

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This file is licensed under the Creative Commons Attribution-Share Alike 2.5 Generic, 2.0 Generic and 1.0 Generic license.
Yma'n gwir dhywgh:
  • a ranna – a dhasskrifa, lesranna ha treuskorra an ober
  • a gemyska – a aswiwa an ober
Yn-dann an ragselyow a syw:
  • askrifans – Res yw dhywgh ri askrifans gwiw, provia kevren dhe'n lecyans, ha meneges mar peu chanjyow gwrys. Hwi a yll gul hemma yn fordh resonus a vynnowgh, mes ny yllir y wul yn fordh a broffo synser an lecyans dh'agas skoodhya po agas devnydh.
  • ranna kehaval – Mar kwrewgh hwi chanjya, treusfurvya po drehevel war an ober ma, res yw dhywgh lesranna agas kevrohow yn-dann an keth lecyans hag an derowel, po lecyans kesplegadow.
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Istori an restren

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Dedhyans/EurSkeusennikMynsowDevnydhyerKampol
a-lemmyn23:11, 26 Du 2020Skeusennik an versyon a-dhia 23:11, 26 Du 2020600 × 480 (9 KB)ParanajaReverted to version as of 21:27, 2 November 2012 (UTC)
21:27, 2 Du 2012Skeusennik an versyon a-dhia 21:27, 2 Du 2012600 × 480 (9 KB)Mikhail RyazanovIQ values are now integers; gnuplot-only approach
09:20, 6 Kevardhu 2006Skeusennik an versyon a-dhia 09:20, 6 Kevardhu 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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