Message-ID: <CAHLnndYRu8G_aFMaGS40i7Om4vQpWKrEfHSyig+d2co9QP8o=Q@mail.gmail.com>
Date: 2015-04-14T17:46:30Z
From: Li Li
Subject: Wrong results from anova
In-Reply-To: <552D51E3.7020504@dewey.myzen.co.uk>
0.003725088 is the mean square error.
2015-04-14 13:44 GMT-04:00 Michael Dewey <lists at dewey.myzen.co.uk>:
> See in-line
>
>
> On 14/04/2015 18:23, li li wrote:
>
>> Hi all,
>> I have following data. When I perform an anova, the residual sum of
>> square returns to be zero.
>> But this is wrong, since we can hand calculate the RSS to be around
>> 0.0308.
>> Did anyone come across the same problem before? Any suggestions?
>> Thanks.
>> Hanna
>>
>> ydata
>>>
>> Y sample.Y
>> 1 0.477 0.5
>> 2 0.477 0.5
>> 3 0.478 0.5
>> 4 27.320 27
>> 5 27.420 27
>> 6 27.300 27
>> 7 29.440 29
>> 8 29.620 29
>> 9 29.610 29
>> 10 35.840 35
>> 11 35.900 35
>> 12 35.850 35
>>
>>> fit.Y <- aov(Y~sample.Y, data=ydata)
>>> summary(fit.Y)
>>>
>> Df Sum Sq Mean Sq F value Pr(>F)
>> sample.Y 3 2203 734.2 190706 <2e-16 ***
>> Residuals 8 0 0.0
>> ---
>> Signif. codes: 0 ?***? 0.001 ?**? 0.01 ?*? 0.05 ?.? 0.1 ? ? 1
>>
>>
> 734.2 / 197096
> [1] 0.003725088
>
> Did you mean 0.0038 above?
>
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>>
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>> and provide commented, minimal, self-contained, reproducible code.
>>
>>
> --
> Michael
> http://www.dewey.myzen.co.uk/home.html
>
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