David.
>
>>
>>> -----Original Message-----
>>> From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of Ashim
>>> Kapoor
>>> Sent: Thursday, December 1, 2016 2:48 PM
>>> To: r-help at r-project.org
>>> Subject: [R] Interpreting summary.lm for a 2 factor anova
>>>
>>> Dear all,
>>>
>>> Here is a small example : -
>>>
>>>> model <- aov(breaks ~ wool * tension, data = warpbreaks)
>>>> summary.lm(model)
>>>
>>> Call:
>>> aov(formula = breaks ~ wool * tension, data = warpbreaks)
>>>
>>> Residuals:
>>> Min 1Q Median 3Q Max
>>> -19.5556 -6.8889 -0.6667 7.1944 25.4444
>>>
>>> Coefficients:
>>> Estimate Std. Error t value Pr(>|t|)
>>> (Intercept) 44.556 3.647 12.218 2.43e-16 ***
>>> woolB -16.333 5.157 -3.167 0.002677 **
>>> tensionM -20.556 5.157 -3.986 0.000228 ***
>>> tensionH -20.000 5.157 -3.878 0.000320 ***
>>> woolB:tensionM 21.111 7.294 2.895 0.005698 **
>>> woolB:tensionH 10.556 7.294 1.447 0.154327
>>> ---
>>> Signif. codes: 0 ?***? 0.001 ?**? 0.01 ?*? 0.05 ?.? 0.1 ? ? 1
>>>
>>> Residual standard error: 10.94 on 48 degrees of freedom
>>> Multiple R-squared: 0.3778, Adjusted R-squared: 0.3129
>>> F-statistic: 5.828 on 5 and 48 DF, p-value: 0.0002772
>>>
>>>> model.tables(model,"e")
>>> Tables of effects
>>>
>>> wool
>>> wool
>>> A B
>>> 2.8889 -2.8889
>>>
>>> tension
>>> tension
>>> L M H
>>> 8.241 -1.759 -6.481
>>>
>>> wool:tension
>>> tension
>>> wool L M H
>>> A 5.278 -5.278 0.000
>>> B -5.278 5.278 0.000
>>>
>>>
>>>> model.tables(model,"m")
>>> Tables of means
>>> Grand mean
>>>
>>> 28.14815
>>>
>>> wool
>>> wool
>>> A B
>>> 31.037 25.259
>>>
>>> tension
>>> tension
>>> L M H
>>> 36.39 26.39 21.67
>>>
>>> wool:tension
>>> tension
>>> wool L M H
>>> A 44.56 24.00 24.56
>>> B 28.22 28.78 18.78
>>>>
>>>
>>> I don't follow the output of summary.lm. I understand the output of
>>> model.tables for effects and means. For instance what does 44.556
>>> represent ? Is it the grand average ? The grand mean is 28.14815. Can
>>> someone help me understand the output of summary.lm ?
>>>
>>> Best Regards,
>>> Ashim
>>>
>>> [[alternative HTML version deleted]]
>>>
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>>
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>
> [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
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> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
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David Winsemius
Alameda, CA, USA