File:Skew normal cdfs.svg
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Summary
[edit]DescriptionSkew normal cdfs.svg |
English: Plots of the cumulative distribution functions for several members of the skew normal family of probability distributions. |
Date | |
Source | Own work |
Author | Skbkekas |
SVG development InfoField | This plot was created with Matplotlib. |
Source code InfoField | Python code##
## Python code used to generate this plot.
## Requires matplotlib, numpy, and the special functions module of scipy.
##
import matplotlib.pyplot as plt
import numpy as np
import scipy.special as sp
def dens(X, a):
Y = 2*np.exp(-X**2/2)/np.sqrt(2*np.pi)
Y *= sp.ndtr(a*X)
return Y
def cdf(X, a):
Y = dens(X, a)
Y = np.cumsum(Y)*(X[1]-X[0])
return Y
w = 1.5
X = np.arange(-3, 3, 0.01)
plt.clf()
colors = ['aqua', 'lime', 'deeppink', 'darkorange', 'blue']
B = [-4, -1, 0, 1, 4]
F = []
for c,b in zip(colors, B):
Y = dens(X, b)
f = plt.plot(X, Y, '-', color=c, lw=w)
F.append(f)
plt.hold(True)
s = ["$\\alpha=%s$" % b for b in B]
b = plt.legend(tuple(F), tuple(s), 'upper left')
plt.ylabel("Density")
b.draw_frame(False)
plt.savefig("skew_normal_densities.svg")
plt.savefig("skew_normal_densities.png")
plt.clf()
F = []
for c,b in zip(colors, B):
Y = cdf(X, b)
f = plt.plot(X, Y, '-', color=c, lw=w)
F.append(f)
plt.hold(True)
b = plt.legend(tuple(F), tuple(s), 'upper left')
plt.ylabel("Cumulative probability")
b.draw_frame(False)
plt.ylim(0,1)
plt.savefig("skew_normal_cdfs.svg")
plt.savefig("skew_normal_cdfs.png")
|
Licensing
[edit]I, the copyright holder of this work, hereby publish it under the following licenses:
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.http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue |
This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license. | ||
| ||
This licensing tag was added to this file as part of the GFDL licensing update.http://creativecommons.org/licenses/by-sa/3.0/CC BY-SA 3.0Creative Commons Attribution-Share Alike 3.0truetrue |
Copyleft: This work of art is free; you can redistribute it and/or modify it according to terms of the Free Art License. You will find a specimen of this license on the Copyleft Attitude site as well as on other sites. http://artlibre.org/licence/lal/enFALFree Art Licensefalsetrue |
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Date/Time | Thumbnail | Dimensions | User | Comment | |
---|---|---|---|---|---|
current | 06:10, 1 March 2009 | 720 × 540 (95 KB) | Skbkekas (talk | contribs) | {{Information |Description={{en|1=Plots of the cumulative distributions for several members of the skew normal family of probability distributions.}} |Source=Own work by uploader |Author=Skbkekas |Date=2009-03-01 |Permission= |other_vers |
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