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cultc
2008 Oct 05
1
Help on R Coding
...onfidence interval for the mean VitC for each
combination of Date and Cult, fixing the value of HeadWt at the mean
for the corresponding cell. I have already proved that Cult and Date
are not interacted. the mean of HeadWt is also found. e.g.2.59
when i type
> new.df<-data.frame(HeadWt=2.59,Cultc52=1,Dated16=1)
> predict(cabbage.lm2,new.df, interval="confidence")
it has error comes up like this:
Error in model.frame.default(Terms, newdata, na.action = na.action,
xlev = object$xlevels) :
variable lengths differ (found for 'Cult')
In addition: Warning message:
'newda...