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Immagine:HittingTimes1.png - Wikipedia

Immagine:HittingTimes1.png

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Description

some stopping times (even hitting times!) of brownian motion

Source

with the help of GNU R statistics / math software. see the source below

Date

8 Apr. 2006

Author

Thomas Steiner

Permission

Thomas Steiner put it under the GFDL


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-source code:

T=7
N=100000
set.seed(303898)
a=0.9
cs=c("orange", "navy", "seagreen4", "grey31")

bm1=c(0,cumsum(rnorm(N,mean=0,sd=sqrt(T/N))))
tau1=which(bm1>a)[1]
bm1[tau1:(N+1)]=a

bm2=c(0,cumsum(rnorm(N,mean=0,sd=sqrt(T/N))))
tau2=which(bm2>a)[1]
bm2[tau2:(N+1)]=a

bm3=c(0,cumsum(rnorm(N,mean=0,sd=sqrt(T/N))))
tau3=which(bm3>a)[1]
bm3[tau3:(N+1)]=a

png(filename = "HittingTimes1.png", width=1200, height=900, pointsize = 12)
par(bg="gray88")
t=seq(0,T,length=N+1)
plot(t,bm1,type="l",ylim=range(bm1,bm2,bm3,a*1.2),col=cs[1],lwd=2,ylab="",xlab="Zeit",main="Hitting time von drei Sampels der Brownschen Bewegung als Beispiel für eine Stoppzeit")
lines(t,bm2,col=cs[2],lwd=2)
lines(t,bm3,col=cs[3],lwd=2)
abline(h=a,col=cs[4],lty=1,lwd=3)

text(x=tau1*T/N,y=a*1.14, labels = substitute(tau[2]==t1,list(t1=tau1*T/N)),pos=4,col=cs[1],cex=1.5)
text(x=tau2*T/N,y=a*1.14, labels = substitute(tau[1]==t2,list(t2=tau2*T/N)),pos=4,col=cs[2],cex=1.5)
text(x=T,y=a*1.14, labels = substitute(tau[3]>T,list(T=T)),pos=2,col=cs[3],cex=1.5)
dev.off()

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aa - ab - af - ak - als - am - an - ang - ar - arc - as - ast - av - ay - az - ba - bar - bat_smg - bcl - be - be_x_old - bg - bh - bi - bm - bn - bo - bpy - br - bs - bug - bxr - ca - cbk_zam - cdo - ce - ceb - ch - cho - chr - chy - co - cr - crh - cs - csb - cu - cv - cy - da - de - diq - dsb - dv - dz - ee - el - eml - en - eo - es - et - eu - ext - fa - ff - fi - fiu_vro - fj - fo - fr - frp - fur - fy - ga - gan - gd - gl - glk - gn - got - gu - gv - ha - hak - haw - he - hi - hif - ho - hr - hsb - ht - hu - hy - hz - ia - id - ie - ig - ii - ik - ilo - io - is - it - iu - ja - jbo - jv - ka - kaa - kab - kg - ki - kj - kk - kl - km - kn - ko - kr - ks - ksh - ku - kv - kw - ky - la - lad - lb - lbe - lg - li - lij - lmo - ln - lo - lt - lv - map_bms - mdf - mg - mh - mi - mk - ml - mn - mo - mr - mt - mus - my - myv - mzn - na - nah - nap - nds - nds_nl - ne - new - ng - nl - nn - no - nov - nrm - nv - ny - oc - om - or - os - pa - pag - pam - pap - pdc - pi - pih - pl - pms - ps - pt - qu - quality - rm - rmy - rn - ro - roa_rup - roa_tara - ru - rw - sa - sah - sc - scn - sco - sd - se - sg - sh - si - simple - sk - sl - sm - sn - so - sr - srn - ss - st - stq - su - sv - sw - szl - ta - te - tet - tg - th - ti - tk - tl - tlh - tn - to - tpi - tr - ts - tt - tum - tw - ty - udm - ug - uk - ur - uz - ve - vec - vi - vls - vo - wa - war - wo - wuu - xal - xh - yi - yo - za - zea - zh - zh_classical - zh_min_nan - zh_yue - zu -

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aa - ab - af - ak - als - am - an - ang - ar - arc - as - ast - av - ay - az - ba - bar - bat_smg - bcl - be - be_x_old - bg - bh - bi - bm - bn - bo - bpy - br - bs - bug - bxr - ca - cbk_zam - cdo - ce - ceb - ch - cho - chr - chy - co - cr - crh - cs - csb - cu - cv - cy - da - de - diq - dsb - dv - dz - ee - el - eml - en - eo - es - et - eu - ext - fa - ff - fi - fiu_vro - fj - fo - fr - frp - fur - fy - ga - gan - gd - gl - glk - gn - got - gu - gv - ha - hak - haw - he - hi - hif - ho - hr - hsb - ht - hu - hy - hz - ia - id - ie - ig - ii - ik - ilo - io - is - it - iu - ja - jbo - jv - ka - kaa - kab - kg - ki - kj - kk - kl - km - kn - ko - kr - ks - ksh - ku - kv - kw - ky - la - lad - lb - lbe - lg - li - lij - lmo - ln - lo - lt - lv - map_bms - mdf - mg - mh - mi - mk - ml - mn - mo - mr - mt - mus - my - myv - mzn - na - nah - nap - nds - nds_nl - ne - new - ng - nl - nn - no - nov - nrm - nv - ny - oc - om - or - os - pa - pag - pam - pap - pdc - pi - pih - pl - pms - ps - pt - qu - quality - rm - rmy - rn - ro - roa_rup - roa_tara - ru - rw - sa - sah - sc - scn - sco - sd - se - sg - sh - si - simple - sk - sl - sm - sn - so - sr - srn - ss - st - stq - su - sv - sw - szl - ta - te - tet - tg - th - ti - tk - tl - tlh - tn - to - tpi - tr - ts - tt - tum - tw - ty - udm - ug - uk - ur - uz - ve - vec - vi - vls - vo - wa - war - wo - wuu - xal - xh - yi - yo - za - zea - zh - zh_classical - zh_min_nan - zh_yue - zu