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| Description | cummulative distribution functions of non central-chi squared distributed random variables with different degrees of freedom and different non-centrality parameters. |
| Date | |
| Source | created with R, see source below |
| Author | Thomas Steiner |
| Permission (Reusing this file) |
Thomas Steiner put it under the CC-by-SA 2.5. |
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R-source code:
df=c(2,2,2,4,4,4)
ncp=c(1,2,3,1,2,3)
cols=c(terrain.colors(length(df))[1:3],heat.colors(length(df))[1:3] )
lw=4
x=seq(0,7.8,length=700)
png(filename="Chi-Squared-(nonCentral)-cdf.png", width=750, height=750, pointsize=12)
plot(x,pchisq(q=x,df=df[1],ncp=ncp[1]),type="l",lwd=lw,col=cols[1],xlab="",ylab="",ylim=c(0,1),cex.axis=1.5)
lines(x,pchisq(q=x,df=df[2],ncp=ncp[2]),col=cols[2],lwd=lw)
lines(x,pchisq(q=x,df=df[3],ncp=ncp[3]),col=cols[3],lwd=lw)
lines(x,pchisq(q=x,df=df[4],ncp=ncp[4]),col=cols[4],lwd=lw)
lines(x,pchisq(q=x,df=df[5],ncp=ncp[5]),col=cols[5],lwd=lw)
lines(x,pchisq(q=x,df=df[6],ncp=ncp[6]),col=cols[6],lwd=lw)
legend(x="bottomright",inset=0.01,
legend=c(expression(list(k==2, lambda==1)),
expression(list(k==2, lambda==2)),
expression(list(k==2, lambda==3)),
expression(list(k==4, lambda==1)),
expression(list(k==4, lambda==2)),
expression(list(k==4, lambda==3))),
col=cols,lwd=lw+2)
dev.off()
-cdf.png){kind=link}
-cdf.png&action=edit&redlink=1){kind=link}
-cdf.png){kind=link}
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 16:42, 3 January 2007 | | 750 × 750 (10 KB) | Thire | {{Information| |Description = cummulative distribution functions of non central-chi squared distributed random variables with different degrees of freedom and different non-centrality parameters. |Source = created with R, see source below |Date = jan 200 |
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-cdf.png){kind=link}