A number of us have interpreted this to mean X1*X2*X3*X4 (including the
lower-order interaction terms, of course). If you run this in MatchIt it
appears to automatically include the lower-order terms.
C
On 4/26/06, Juan Vargas <jfvargas(a)fas.harvard.edu > wrote:
Hi,
What does exactly "all their multiplicative interactions" mean? Is is
all the possible interactions of pairs of covariates or are we supposed
to allow for higher order intercations of the type: X1*X2*X3*X4?
Juan
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