Package suggested but not available for checking: ‘optmatch’
Running examples in ‘bigmatch-Ex.R’ failed
The error most likely occurred in:

> ### Name: check
> ### Title: Check SMDs of the matched data set.
> ### Aliases: check
> 
> ### ** Examples
> 
> # To run this example, you must load the optmatch package.
> 
> # Caliper of .2 on the propensity score, near fine balance of
> # education, a robust Mahalanobis distrance for X.
> data(nh0506)
> attach(nh0506)
> X<-cbind(female,age,black,hispanic,education,povertyr,bmi)
> m<-nfmatch(z=z,p=propens,fine=education,X=X,caliper=.2,dat=nh0506,rank=FALSE)
Error in nearfine(z, fine, dist, dat, ncontrol, penalty, max.cost, nearexPenalty,  : 
  Error: package optmatch (>= 0.9-1) not loaded.  To run rcbalance command, you must install optmatch first and agree to the terms of its license.
Calls: nfmatch -> nearfine
Execution halted