Image:Simpson's paradox continuous.svg

[edit] Summary

Example of the continuous 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()
  

This chart was created with R.

[edit] Licensing

I, Schutz, the copyright holder of this work, hereby release it into the public domain. This applies worldwide. In case this is not legally possible: I grant anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law. Afrikaans | Alemannisch | Aragonés | العربية | Asturianu | Български | Català | Česky | Cymraeg | Dansk | Deutsch | Eʋegbe | Ελληνικά | English | Español | Esperanto | Euskara | Estremeñu | فارسی | Français | Galego | 한국어 | हिन्दी | Hrvatski | Ido | Bahasa Indonesia | Íslenska | Italiano | עברית | Kurdî / كوردی | Latina | Lietuvių | Latviešu | Magyar | Македонски | Bahasa Melayu | Nederlands | ‪Norsk (bokmål)‬ | ‪Norsk (nynorsk)‬ | 日本語 | Polski | Português | Ripoarisch | Română | Русский | Shqip | Slovenčina | Slovenščina | Српски / Srpski | Svenska | ไทย | Tagalog | Türkçe | Українська | Tiếng Việt | Walon | ‪中文(简体)‬ | ‪中文(繁體)‬ | zh-yue-hant | +/-

• Simpson's paradox