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为什么有时我不能将类定义设置为s4类中的槽?

r=ks.test(x=rnorm(100), "dnorm")
class(r)
[1] "htest"


## Doesnt work, "htest" is class in stats
setClass("Jergon", representation(fit="htest"))
[1] "Jergon"
Warning message:
undefined slot classes in definition of "Jergon": fit(class "htest")


## works "lm" 
setClass("Jergon", representation(am="lm"))
[1] "Jergon"
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r class s4

6
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1
解决办法
1260
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