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.
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