[R] Wrong results from anova

[li li]

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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>>
> --
> Michael
> http://www.dewey.myzen.co.uk/home.html
>

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