Statistics "Prove" Ether Exists! Michelson-Morley and the Speed of Light

Mickelson-Morley plot

Carver's (1993) reanalysis of data from the famed 1887 Michelson-Morley experiment demonstrates that the hypothesis, "the speed of light depends on the direction of travel through the ether", cannot be rejected even at a .001 level of statistical significance. Thus ether is confirmed and Einstein's Theory of Relativity invalidated. Relativity's consequences, such as the Atomic Bomb, are seen to be misunderstandings at best, hoaxes at worst.

The moral of Carver's story is that significance testing is never decisive.

More informative than statistical testing, however, is plotting the data points as Michelson & Morley (1887) did. Their Figure is reproduced here. The upper curve is for the noon observations and the lower for the evening ones. The dotted curves represent one-eighth of the amplitudes away from the X-axis predicted by the "ether" theory. The solid lines represent the empirical results. The solid lines (the effect size) do exhibit some waviness and are indeed statistically "significantly" different from the straight lines predicted by non-ether theory. But do they provide support for the ether theory? The slight empirical waviness indicates that less than 1% of the variance of the speed of light is associated with direction, a substantive rejection of the ether theory. Relativity can be reinstated!

Several methodological conclusions result from comparing the graph with the "significance" analysis:

1) Well designed graphs always convey the meaning of results better than summary statistics and significance test results, and with less opportunity for confusion.

2) Effect sizes must be reported along with significance tests for correct conclusions to be drawn.

3) Type I errors (failures to reject incorrect null hypotheses) can occur even at the very demanding .001 level.

Mark Stone

Adler School of Professional Psychology

Chicago, Illinois

Carver R (1993) The case against statistical significance testing, revisited. The Journal of Experimental Education 61:4287-292.

Michelson A, Morley E (1887) On the relative motion of the earth and the luminiferous ether. American Journal of Science, 34, 333-341.

"I sometimes have a nightmare about Kepler. Suppose a few of us were transported back in time to the year 1600, and were invited by the Emperor Rudolph II to set up an Imperial Department of Statistics in the court at Prague. Despairing of those circular orbits, Kepler enrolls in our department. We teach him the general linear model, least squares, dummy variables, everything. He goes back to work, fits the best circular orbit for Mars by least squares, puts in a dummy variable for the exceptional observation - and publishes. And that's the end, right there in Prague at the beginning of the 17th century."
Freedman, D.A. (1985). Statistics and the scientific method. In W.M. Mason & S.E. Fienberg (Eds.), Cohort analysis in social research: Beyond the identification problem (pp. 343-366). New York: Springer-Verlag. P.35

Courtesy of Andrew Kyngdon

Statistics "Prove" Ether Exists! Stone M. H. … Rasch Measurement Transactions, 1997, 11:1 p. 541.

Rasch Publications
Rasch Measurement Transactions (free, online) Rasch Measurement research papers (free, online) Probabilistic Models for Some Intelligence and Attainment Tests, Georg Rasch Applying the Rasch Model 3rd. Ed., Bond & Fox Best Test Design, Wright & Stone
Rating Scale Analysis, Wright & Masters Introduction to Rasch Measurement, E. Smith & R. Smith Introduction to Many-Facet Rasch Measurement, Thomas Eckes Invariant Measurement: Using Rasch Models in the Social, Behavioral, and Health Sciences, George Engelhard, Jr. Statistical Analyses for Language Testers, Rita Green
Rasch Models: Foundations, Recent Developments, and Applications, Fischer & Molenaar Journal of Applied Measurement Rasch models for measurement, David Andrich Constructing Measures, Mark Wilson Rasch Analysis in the Human Sciences, Boone, Stave, Yale
in Spanish: Análisis de Rasch para todos, Agustín Tristán Mediciones, Posicionamientos y Diagnósticos Competitivos, Juan Ramón Oreja Rodríguez

To be emailed about new material on
please enter your email address here:

I want to Subscribe: & click below
I want to Unsubscribe: & click below

Please set your SPAM filter to accept emails from welcomes your comments:

Your email address (if you want us to reply):


ForumRasch Measurement Forum to discuss any Rasch-related topic

Go to Top of Page
Go to index of all Rasch Measurement Transactions
AERA members: Join the Rasch Measurement SIG and receive the printed version of RMT
Some back issues of RMT are available as bound volumes
Subscribe to Journal of Applied Measurement

Go to Institute for Objective Measurement Home Page. The Rasch Measurement SIG (AERA) thanks the Institute for Objective Measurement for inviting the publication of Rasch Measurement Transactions on the Institute's website,

Coming Rasch-related Events
June 23 - July 21, 2023, Fri.-Fri. On-line workshop: Practical Rasch Measurement - Further Topics (E. Smith, Winsteps),
Aug. 11 - Sept. 8, 2023, Fri.-Fri. On-line workshop: Many-Facet Rasch Measurement (E. Smith, Facets),


The URL of this page is