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Partial eta-squared is a measure of variance, like r-squared. It tells us what proportion of the variance in the dependent variable is attributable to the factor in question. You can get these measures by choosing the 'Estimates of effect size' option when setting up an ANOVA.
ETA is the largest supplier of movements in Switzerland. Currently about 80% of Swiss watches have ETA movements. ETA is owned by the Swatch Group conglomerate. Eta was formed in 1983 with the merger of ASUAG and SSIH.