File:Sech squared a arctanh.png

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Summary

This is a plot comparing a histogram of real data with a normal distribution, a logistic distribution, and a distribution defined as

$f(x;\mu ,s)={\frac {a}{4s\cosh ^{2}\left[a\sinh ^{-1}\left({\frac {x-\mu }{2s}}\right)\right]{\sqrt {{\frac {(x-\mu )^{2}}{4s^{2}}}+1}}}}$

...where $a=1.6,\,s\approx \sigma /{\sqrt {2.25}}=2\sigma /3$ .

File information
Description	Plot comparing real data histogram, a normal distribution, a logistic distribution, and f=a/(4s cosh^2[a sinh^-1(x-μ)/(2s)] sqrt[(x-μ)/(4 s^2)+1])
Source	I (~Amatulić (talk)) created this work entirely by myself.
Date	21:16, 4 May 2010 (UTC)
Author	~Amatulić (talk)
Permission (Reusing this file)	See below.

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	21:16, 4 May 2010		640 × 436 (11 KB)	Anachronist (talk \| contribs)	{{Information \|Description = Plot comparing real data histogram, a normal distribution, a logistic distribution, and f=a/(4s cosh^2[a sinh^-1(x-μ)/(2s)] sqrt[(x-μ)/(4 s^2)+1]) \|Source = I (~~~) created this work entirely by myself. \|Date

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