When I want to compare the means between two groups I use a t-test. But how do I check whether the means of three groups are equal or statistically different?
E.g. compare the average labour productivity of small, medium and large firms.
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1$\begingroup$ user 21342 - you have been given a reasonable answer to your question. If that answer is acceptable, you should really do the right thing and accept it - I doubt anyone is going to offer a more substantive one. If it is not acceptable, you should indicate why. $\endgroup$– Glen_bCommented Mar 17, 2013 at 0:37
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Check out One-way analysis of variance
In statistics, one-way analysis of variance (abbreviated one-way ANOVA) is a technique used to compare means of two or more samples (using the F distribution).
