Shawn Carlson's Double-Blind Astrology Experiment
U-Turn in Carlson's Astrology test?
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This article has been peer reviewed by subject matter experts refereed by the publisher.
Volume 27(2), July 2011 (pp.7-33)
U-turn in Carlson's Astrology Test?
Robert Currey

New Scientific Support for astrology comes from a surprising source.

In 1985, Nature, one of the world's most prestigious scientific journals, published "A Double Blind Test of Astrology", now known as the 'Carlson experiment'. The conclusion was that natal astrology as practised by reputable astrologers was no better than chance. For astrology, it was a landmark experiment that continues to undermine the credibility of every astrological consultant, researcher and school. Recent research shows not only that Carlson's conclusions were wrong (Vidmar 2008), but also that his experiment produced evidence that the tested astrologers performed their tasks successfully to a level that could not be explained by chance (Ertel 2009).

This article attempts to synthesise the evidence from different sources with some additional observations. It seeks to clarify how Carlson imported the results of one test into another separate test. This led to sampling errors that disguised results that favoured the astrologers - results that were later discovered by Professor Ertel. To balance this, an attempt is made, here, to present the sceptical reaction to this new evidence. Graphics have been compiled to display the astrologers' predicted rating of their matches weighted by the frequency and to show how enabling astrologers to make these confidence judgements with the data amplifies the precision. ...pdf of full article now available on-line...

Copyright 2010 Published by the AA of GB
Thanks to Dr. Pat Harris, Ken McRitchie, Dr. Geoffrey Dean, Professor Suitbert Ertel, Professor Joseph Vidmar, Karen Chiarello, Deborah Houlding, and Jill Davies for their help and advice.

Robert Currey, BSc.[Hons], DF Astrol.S., Cert.Int.ACG.

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The full article is published in Correlation, the Astrological Association Journal of Research in Astrology (July, 2011). To obtain copies or for a subscription go to the

Note: I take no credit for the journal cover (above)! ~ Robert Currey
Graphs from the Paper

Results of the Carlson Test

Results of the Carlson Test

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