I think you forgot to turn site and year into factors. (The 1 Df is the
giveaway).
-pd
> On 15 May 2017, at 19:40 , Lucy McMahon <lucymcmahon...@hotmail.co.uk> wrote:
>
> R-help:
>
> I'm looking into the abundance of an algal species over site and years using
> a two-way ANOVA:
>
>> summary (aov (fserratus ~ site+year))
> Df Sum Sq Mean Sq F value Pr(>F)
> site 1 1487 1486.6 6.094 0.0155 *
> year 1 1173 1172.8 4.808 0.0309 *
>
> But I'm receiving the following warning messages when I run the Tukey test.
>> TukeyHSD(aov(fserratus ~ site+year))
>
> $site
> diff lwr upr
> p adj
> 1-0 -8.039565 -14.51045 -1.568685 0.0154723
>
> Warning messages:
> 1: In replications(paste("~", xx), data = mf) : non-factors ignored: year
> 2: In TukeyHSD.aov(aov(fserratus ~ site + year)) :
> 'which' specified some non-factors which will be dropped
>
>
> Any advice would be appreciated, thanks.
>
>
>
>
> [[alternative HTML version deleted]]
>
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--
Peter Dalgaard, Professor,
Center for Statistics, Copenhagen Business School
Solbjerg Plads 3, 2000 Frederiksberg, Denmark
Phone: (+45)38153501
Office: A 4.23
Email: pd....@cbs.dk Priv: pda...@gmail.com
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