I can't figure out how to get the "summary" method in the URCA package to
work.
E.g. when I use the following code fragment in the help for the "ca.jo"
function,
it always tries to use the "summary" method from the "base" package,
not the "urca" package. 

How do I force it use the "summary" method of the "urca" package?
I'm sure this is in some documentation somewhere, but
after (admittedly quickly) scanning several docs, I've not 
found any help on this.

Thank you.

     data(finland)
     sjf <- finland
     sjf.vecm <- ca.jo(sjf, constant=FALSE, type="eigen", K=2,
     spec="longrun", season=4, ctable="A2")
     summary(sjf.vecm)


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