Test for conditional independence in a dataframe.
1 
x 
A dataframe. 
set 

... 
set
can be 1) a vector or 2) a righthand 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 righthand sided formula:
The order of the variables does matter.)
If set
is NULL
then it is tested whether the first two
variables are conditionally independent given the remaining variables.
If set
consists only of factors then x[,set]
is
converted to a contingency table and the test is made in this table
using ciTest_table()
.
If set
consists only of numeric values and integers then x[,set]
is
converted to a list with components cov
and n.obs
by
calling cov.wt(x[,set], method='ML')
. This list is then passed
on to ciTest_mvn()
which makes the test.
An object of class 'citest' (which is a list).
S<f8>ren H<f8>jsgaard, sorenh@math.aau.dk
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