Image:OrnsteinUhlenbeck3.png

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Description

three sample paths of an Ornstein-Uhlenbeck Process

English:
Source

made with the free software R, see the source code at the bottom

Date

20 Dec 2005

Author

Thomas Steiner

Permission
(Reusing this image)

Thomas Steiner put it under the GFDL

Other versions Image:OrnsteinUhlenbeck.png (replaced because such a filename exists in the german wikipedia)


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".

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R-Quelltext:

#Orenstein-Uhlenbeck Prozess mit normalverteiltem Anfangswert
ou<-function(theta=1, mu=1.2, sigma=0.3, init=c(mu, sigma^2/(2*theta)), from=0, to=2, steps=500*(to-from)) {
  t<-seq(from,to,length=steps)
  oup<-rnorm(n=1,mean=init[1],sd=sqrt(init[2]))
  for (i in (1:(steps-1))) {
    oup[i+1]=oup[i] + theta*(mu-oup[i])*(to-from)/steps+sigma*rnorm(n=1,mean=0,sd=sqrt(sigma^2*(to-from)/steps))
  }
  return(oup)
}

cols=c("navy", "darkolivegreen4", "red")
t<-seq(0,2,length=1000)
set.seed(311051)

png(filename="OrnsteinUhlenbeck3.png", width=1200, height=900, pointsize=12)
par(bg="lightgrey")
matplot(t,ou(init=c(0,0)),type="l", xlab="", ylab="",col=cols[1], lwd=2, ylim=c(0,2))
lines(t,ou(init=c(2,0)),col=cols[2], lwd=2)
lines(t,ou(),col=cols[3], lwd=2)
title(main="Ornstein - Uhlenbeck", cex.main=2.5)
text(x=1.85,y=0,expression(list(theta==1, mu==1.2, sigma == 0.3)) )
text(x=1.55,y=1.75,expression(paste("d",X[t]==theta(mu-X[t]),"dt+",sigma,"d", W[t])),cex=2.5)
text(x=0,y=0.07, expression(X[0]==0),col=cols[1])
text(x=0,y=1.92, expression(X[0]==2),col=cols[2])
text(x=0.03,y=1.29, expression(paste(X[0], "~N(", mu,",", frac(sigma^2,2*theta), ")") ),col=cols[3])
abline(h=1.2, lty=3, col="grey25")
dev.off()

Historique du fichier

Cliquer sur une date et une heure pour voir le fichier tel qu’il était à ce moment-là

Date et heureDimensionsUtilisateurCommentaire
actuel21 décembre 2005 à 00:571 200×900 (12 Kio)Thire (now the right file?!)
20 décembre 2005 à 17:341 200×900 (20 Kio)Thire ({{Information| |Description = three sample paths of an Ornstein-Uhlenbeck Process |Source = made with the free software ''R'', see the source code at the bottom |Date = 20 Dec 2005 |Author = Thomas Steiner |Permission = [[:de:Benutz)

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