The 2600 community adult subjects tested in the 1989 MMPI restandardization project by Butcher, Dahlstrom Graham, Tellegen, and Kaemmer were grouped on the basis of their astrological sign the year of their birth in the oriental yearly cycle, and the day of the week on which they were born. Analyses of variance were carried out on the T scores of the basic MMPI profile scales for both males and females on each of these categories. No effect size (R2) larger than 2% was obtained on any scale in these analyses. No evidence was found in support of these folklore concepts. Discussion focused on the continuing paucity of empirical research on and support for these notions.
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