Dear Peter,
thank you so much for the quick and helpful reply - it was exactly what I was
looking for.
Regards,
Bertolt
Am 03.02.2011 um 13:49 schrieb Peter Ehlers:
> On 2011-02-03 04:30, Bertolt Meyer wrote:
>> Dear R-Users,
>>
>> I have a trivial problem, but extensive googling and ??'ing did not solve
>> it: I want to obtain the sums of squares from a summary.aov() object for
>> later use. Example:
>>
>>> DV<- rnorm(100)
>>> IV1<- as.factor(rep(c("male", "female"), times = 50))
>>> IV2<- as.factor(rep(c("young", "old"), times = 50))
>>>
>>> summary(aov(DV ~ IV1 * IV2))
>>
>> Df Sum Sq Mean Sq F value Pr(>F)
>> IV1 1 0.215 0.21499 0.2277 0.6343
>> Residuals 98 92.523 0.94411
>>
>> How can I store the sums of squares in a variable for later use? Like this:
>>
>>> some.magic.command()
>> [1] 0.215 92.523
>
> str() is your friend.
>
> str( summary(aov(DV ~ IV1 * IV2)) )
>
> shows that the summary is a list containing a data.frame.
> Use
>
> summary(aov(DV ~ IV1 * IV2))[[1]]
>
> to extract the data.frame and any one of
>
> summary(aov(DV ~ IV1 * IV2))[[1]][, 2]
> summary(aov(DV ~ IV1 * IV2))[[1]][, 'Sum Sq']
> summary(aov(DV ~ IV1 * IV2))[[1]]$'Sum Sq'
>
> to extract the sum-of-squares vector.
>
> Peter Ehlers
>
>>
>> Thank you,
>> Bertolt
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