# [R] aov summary to matrix

Prof Brian Ripley ripley at stats.ox.ac.uk
Tue Aug 17 23:32:54 CEST 2004

```On Tue, 17 Aug 2004, Moises Hassan wrote:

> Is there an easy way of converting an aov.summary into a matrix in which
> the rows are the factor names and the columns are Df, Sum Sq, Mean Sq, F
> value and Pr.

You are confusing the printed representation with the object (which seems
today's favourite misconception).

as.matrix(summary(npk.aov)[[1]])

is a matrix (to full precision) as you seek, although I would prefer to
work with the data frame which is returned.

(Note: your output is from MASS4 & example(aov), unattributed.)

> For example, convert
>
>             Df Sum Sq Mean Sq F value   Pr(>F)
> block        5 343.29   68.66  4.4467 0.015939 *
> N            1 189.28  189.28 12.2587 0.004372 **
> P            1   8.40    8.40  0.5441 0.474904
> K            1  95.20   95.20  6.1657 0.028795 *
> N:P          1  21.28   21.28  1.3783 0.263165
> N:K          1  33.14   33.14  2.1460 0.168648
> P:K          1   0.48    0.48  0.0312 0.862752
> Residuals   12 185.29   15.44
> ---
> Signif. codes:  0 `***' 0.001 `**' 0.01 `*' 0.05 `.' 0.1 ` ' 1
>
>
> To
>
> Factor      Df Sum Sq  Mean Sq F value   Pr
> block        5 343.29   68.66  4.4467 0.015939
> N            1 189.28  189.28 12.2587 0.004372
> P            1   8.40    8.40  0.5441 0.474904
> K            1  95.20   95.20  6.1657 0.028795
> N:P          1  21.28   21.28  1.3783 0.263165
> N:K          1  33.14   33.14  2.1460 0.168648
> P:K          1   0.48    0.48  0.0312 0.862752
> Residuals   12 185.29   15.44    NA      NA

--
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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