Generic function for conditional independence test
Generic function for conditional independence test. Specializes to specific types of data.
ciTest(x, set = NULL, ...)
x |
An object for which a test for conditional independence is to be
made. See 'details' for valid types of |
set |
A specification of the test to be made. The tests are of the form
u and v are independent condionally on S where u and v are variables and
S is a set of variables. See 'details' for details about specification of
|
... |
Additional arguments to be passed on to other methods. |
x can be
a table,
a dataframe whose columns are numerics and factors or
a list with components cov and
n.obs.
set can be
a vector,
a right-hand sided formula in which variables are separated by '+'.
In either case, it is tested if the first two variables in the
set are conditionally independent given the remaining
variables in set. (Notice an abuse of the '+' operator in
the right-hand sided formula: The order of the variables does
matter.)
An object of class citest (which is a list).
Søren Højsgaard, sorenh@math.aau.dk
## contingency table: data(reinis) ## dataframe with only numeric variables: data(carcass) ## dataframe with numeric variables and factors: data(milkcomp1) ciTest(cov.wt(carcass, method='ML'), set=~Fat11 + Meat11 + Fat12) ciTest(reinis, set=~smo + phy + sys) ciTest(milkcomp1, set=~tre + fat + pro)
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