dependency on optmatch about matchit HOT 3 CLOSED

Ahh, perhaps this was the original reason?

#3

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Simply speaking, it's because MatchIt only needs optmatch if you are using optimal or full matching, which are not necessarily the right methods to use for a given application. Any packages that are not required for all methods (or for the default method) are in Suggests and not Imports because we should not require users to install every package when they are only using one matching method. This also keeps the package robust in case a package is removed from CRAN, which has happened in the past. I believe the package would be fully compliant if any of the Suggested packages were removed from CRAN; one could still build the package and use the matching methods that do not depend on that package.

The help page for each matching methods lists the packages that are required for that method to work.

from matchit.

That's helpful - thanks.

from matchit.