ANOVA is usually thought as equivalent to linear regression, which is very interesting.
Who first discovered this fact? Did Fisher know about this when he worked on ANOVA?
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Isn't it more that linear regression (ordinary least squares regression) and ANOVA are both cases of the *general linear model*. See this [Q&A](http://stats.stackexchange.com/q/555/1390) for a related discussion. I recalled reading somewhere that the general linear model entered the literature in the 50s or 60s, somewhat before the later generalization to generalized linear models (GLMs) in the 1970s and later, but I can't see to find or recall where I read the bit about the general linear model any longer. – Gavin Simpson Jun 18 '15 at 16:02
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In terms of treating them as different classes of the same basic regression model, didn't that originate with Jacob Cohen with Psych Bull paper in 1968? Jacob Cohen (1968), "Multiple regression as a general data-analytic system", Psychological Bulletin 70 (6): 426–443 – Mike Hunter Oct 19 '15 at 16:32