Test for conditional independence in a dataframe.
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
set can be 1) a vector or 2) 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.)
NULL then it is tested whether the first two
variables are conditionally independent given the remaining variables.
set consists only of factors then
x[,set] is converted to a
contingency table and the test is made in this table using
set consists only of numeric values and integers then
x[,set] is converted to a list with components
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<c3><b8>ren H<c3><b8>jsgaard, [email protected]
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