[R-sig-teaching] random effect model in R---- lmer

[Yahoo!]

Dear All:


 
I am trying to run arandom effect model in R, but when I used "lmer" I got the followingerrors: Please see below.


 
library(lme4)


 
batchlevel <-c(1,1,1,2,2,2,3,3,3,4,4,4,5,5,5)


 
batch <-as.character(batchlevel)


 
yield <-c(74,76,75,68,71,72,75,77,77,72,74,73,79,81,79)


 
dataaov <-data.frame(batch,yield)


 
raneff <-lmer(yield~1+(1|batch),data=dataaov)


 
Error in get(name,envir = asNamespace(pkg), inherits = FALSE) : 

  object'.setDummyField' not found


 
summary(raneff)


 

 
 Error insummary(raneff) : 

  error inevaluating the argument 'object' in selecting a method for function 'summary':Error: object 'raneff' not found


 

 
Any help will be highlyappreciated.


 
many thanks

abou

 ========================
AbouEl-Makarim Aboueissa
Sozan Elsalakawy
Mohamed Agamia

246 Auburn Street, #158
Portland, ME 04103
USA

Tel: (207) 797-2724
Email: aboueiss at yahoo.com
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