File:First order hsked.svg
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Summary
W3C-validity not checked.
| Description |
English: Simple plot of random data with w:Heteroscedasticity, including a naive linear regression |
| Date | 19:03, 29 July 2010 (UTC) |
| Source | I (Protonk (talk)) created this work entirely by myself. |
| Author | Protonk (talk) |
Reproducible in R using the following code:
#simple hsked plot
set.seed(127)
x<-seq(1,200,1)
y<-3.8*x+25+err
err<-NULL
for(i in c(1:200)) {
err[i]<-rnorm(1,0,i)
}
y<-3.8*x+25+err;
plot(y~x,pch=20,main="Random Data with First-Order Heteroskedastic Errors")
abline(coef=lm(y~x)$coefficients,col=3)
legend(15,900,col=c(1,3),legend=c("Data Points","Linear Regression"),fill=c(1,3));
text(100,991,labels="Adj.",col=3)
text(110,1000,labels=expression(R^2),col=3)
text(116,995,labels="=",col=3)
text(128,995,labels=signif(summary(naivelm)$adj.r.squared,digits=4),col=3);
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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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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 19:03, 29 July 2010 | | 630 × 630 (142 KB) | Protonk | {{Information |Description = Simple plot of random data with Heteroscedasticity, including a naive linear regression |Source = I (~~~) created this work entirely by myself. |Date = ~~~~~ |Author = ~~~ |other_versions |
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