DescriereMichelsonmorley-boxplot.svg	Boxplot representing A. Michelson's data on the speed of light (1882). It consists of five experiments, each made of 20 consecutive runs.
Dată	28 decembrie 2006
Sursă	Operă proprie
Autor	User:Schutz
SVG dezvoltare InfoField	Sursa acestui fișier SVG este validă.  Această imagine vectorială a fost creată cu R

This data is not from the Michelson-Morley experiment but from Michelson's measurement of the speed of light. See MICHELSON, A. A. (1882): Experimental determination of the velocity of light made at the United States Naval Academy, Annapolis. Astronomic Papers 1, pp. 109-145 U.S. Nautical Almanac Office, or S. M. Stigler (1977): Do robust estimators work with real data? Annals of Statistics 5, 1055–98. Experiment 3 has the smallest data spread, discarding 1:5 runs as outliers.

Boxplot representing A. Michelson's data on the speed of light (1882). It consists of five experiments, each made of 20 consecutive runs. Note that the oblique line is incorrect, probably due to a bug in the Mediawiki software/SVG converter. The graphic was created by User:Schutz for Wikipedia on 28 December 2006, using the R statistical project. The program that generated the graphic is given below; the data and the idea are from the R help page for the morley dataset (see help(morley)). The graph was exported in postscript format, converted to SVG using the postedit command, and the layout was slightly modified using Inkscape before upload.

 
  data(morley)
  morley$Expt <- factor(morley$Expt)
  morley$Run <- factor(morley$Run)
  attach(morley)

  postscript("Michelsonmorley-boxplot.ps", paper="special", height=6, width=6,
             horizontal=F)
  par(las=1)
  par(mar=c(5.1, 5.1, 2.1, 2.1))
  par(font=2)
  par(font.axis=2)
  boxplot(Speed ~ Expt, xlab = "Experiment No.", ylab="Speed of light (km/s minus 299,000)")
  abline(h=792.458, lty=3)
  dev.off()
  

Boxplot representing A. Michelson's data on the speed of light (1882). It consists of five experiments, each made of 20 consecutive runs.

The graphic was originally created by User:Schutz for Wikipedia on 28 December 2006, using the R statistical project. The program that generated the graphic is given below; the data and the idea are from the R help page for the morley dataset (see help(morley)). The graph was exported in PDF format, converted to SVG using Adobe Illustrator, and the layout was slightly modified using Vim before upload.

data(morley)
morley$Expt <- factor(morley$Expt)

pdf("Michelsonmorley-boxplot.pdf", height=6, width=6)
par(las=1, mar=c(5.1, 5.1, 2.1, 2.1))
boxplot(Speed ~ Expt, morley, xlab = "Experiment No.",
        ylab="Speed of light (km/s minus 299,000)")
abline(h=792.458, col="red")
text(3,792.458,"true\nspeed")
dev.off()

Eu, deținătorul drepturilor de autor ale acestei opere, o eliberez domeniului public. Aceasta se aplică în întreaga lume. În anumite țări există posibilitatea ca acest lucru să nu fie legal posibil; în acest caz: permit oricui să utilizeze această operă în orice scop, fără nicio condiție, atâta timp cât asemenea condiții nu sunt cerute de lege.

The creator and uploader also believes that this graphic is a trivial work which does not qualify for copyright.

• A. J. Weekes (1986) A Genstat Primer. London: Edward Arnold.