[R] TukeyHSD fails on my data

Gav Wood news at gavofyork.fastmail.fm
Mon May 7 20:58:52 CEST 2007

Howdo folks,

So I have my data (attached). There are two columns I'm interested in; 
"algname" and "dur". I'd like to know how dur changes with algname. 
algname is nominal and there are 7 possibilities. There are two more 
nominal independents, "task" and "id", so my model is:

dur ~ algname+task+id

 From the research I've done, a TukeyHSD seems to be what I need, so I do:

TukeyHSD(aov(dur ~ algname+task+id, cstats), ordered=T)

But I get this back:

Error in rep.int(n, length(means)) : unimplemented type 'NULL' in 'rep'
In addition: Warning messages:
1: non-factors ignored: task in: replications(paste("~", xx), data = mf)
2: non-factors ignored: id in: replications(paste("~", xx), data = mf)

Can anyone shed any light on the situation?


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