Re: Contrasts

From: jason <asremlforum_at_VSNI.CO.UK>
Date: Sat, 11 Jul 2009 08:11:19 +0100

Arthur wrote:
> Dear Jason,
> ............
> One approach would be to calculate the predicted Variety:Nitrogen means
> with their variance matrix, and then do a t test of the difference between the
> mean for Marvelous:0.2cwt and Victory:0.2cwt
> In this balanced example, this should give the same result but in general,
> the test of a regression coefficient, an an ANOVA statistic may give different results.
> I trust this helps explain the principles behind the calculation.

Thanks, Arthur! For the alternative approach using t test, how to calculate the degree of freedom then?


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Received on Sun Jul 11 2009 - 08:11:19 EST

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