File:Simpson's paradox continuous.svg
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Original file (SVG file, nominally 390 × 260 pixels, file size: 18 KB)
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This is a file from the Wikimedia Commons. The description on its description page there is shown below.
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Summary
| Description |
English: Illustration of the quantitative version of en:Simpson's paradox: a positive trend appears for two separate groups (blue and red), whereas a negative trend (black, dashed) appears when the groups are combined. |
| Date | |
| Source | Own work |
| Author | Schutz |
Example of the quantitative version of w:Simpson's paradox.
The graphic was created by User:Schutz for Wikipedia on 14 June 2007, using the R statistical project. The program that generated and exported the graphic is given below; the uploaded version was generated slightly differently to workaround a bug during the PS to SVG conversion with pstoedit command. The layout was slightly modified using Inkscape before upload.
x1 <- c(1,2,3,4)
y1 <- x1 + 5
x2 <- x1 + 7
y2 <- x2 - 7
x <- c(x1,x2)
y <- c(y1,y2)
postscript("simpson.eps", paper="special", width=4.5, height=3)
par(las=1)
par(mar=c(3,3,0.5,0.5))
par(mgp=c(2,1,0))
plot(x,y, cex=2, pch=21,
col=rep(c("blue", "red"), each=4), bg=rep(c("lightblue", "pink"), each=4),
xlim=range(x)+c(-2,2), ylim=range(y)+c(-2,2))
abline(lm(y1 ~ x1), col="blue", lwd=2)
abline(lm(y2 ~ x2), col="red", lwd=2)
abline(lm(y ~ x), lwd=2, lty=2)
dev.off()
Licensing
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This work has been released into the public domain by its author, I, Schutz. This applies worldwide. In some countries this may not be legally possible; if so: I, Schutz grants anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law. |
File history
Click on a date/time to view the file as it appeared at that time.
| Date/Time | Dimensions | User | Comment | |
|---|---|---|---|---|
| current | 16:15, 13 June 2007 | 390 × 260 (18 KB) | Schutz | {{Information |Description=Illustration of the continuous version of Simpson's paradox |Source=self-made |Date=14 June 2007 |Author=Schutz }} Example of the continuous version of w:Simpson's paradox. The graphic was created by [[User |
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