[R] TukeyHSD error

[Steven Ranney]

All -

I think I'm being dense, but for the life of me, I can't figure out
why I get error message with the code below.

I have data that looks like

param level perc.surv asin.tran
DO     3 0.6864407 0.9764544
DO     3 0.1250000 0.3613671
DO     3 0.8738739 1.2077299
DO     4 0.4615385 0.7468986
DO     4 0.5691057 0.8547258
DO     4 0.8504673 1.1737517
DO     6 0.5494505 0.8349297
DO     6 0.4938272 0.7792252
DO     6 0.1230769 0.3584500
DO     6 0.7209302 1.0142339
DO     6 0.2297297 0.4998584
DO     6 0.9300000 1.3030330
DO     6 0.4482759 0.7335813
DO     6 0.0000000 0.0000000
DO     6 0.6018519 0.8879679


and code

aov.DO <- aov(asin.tran~level)
summary(aov.DO)
TukeyHSD(aov.DO)

When I run the final line, I get the following error message

"Error in TukeyHSD.aov(aov.DO) : no factors in the fitted model
In addition: Warning message:
In replications(paste("~", xx), data = mf) : non-factors ignored: level"

What am I missing?

Thanks for your help -

Steven Ranney
steven.ranney at montana.edu