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2009 Oct 19
1
Defining S3-methods for S4-objects: cannot coerce type 'S4' to vector of type 'integer'
In the 'doBy' package there is an esticon() function for calculating linear contrasts for various model types. I have defined an S3-method 'esticon.mer()' for 'mer' objects from the lme4 package. Building the package and invoking the method gives:
> esticon(fm1, c(1,1))
Confidence interval ( WALD ) level = 0.95
Error in as.integer(x) :
cannot coerce type 'S4'