| tightenBlock-package | Tightens an Observational Block Design by Balanced Subset Matching | 
| addMahal | Rank-Based Mahalanobis Distance Matrix | 
| addNearExact | Add a Near-exact Penalty to an Exisiting Distance Matrix. | 
| aHDLt | Alcohol and HDL Cholesterol | 
| makematch | Make a Match Using Two Criteria Matching with Optimal Subset Matching | 
| makenetwork | Make the Network Used for Matching with Two Criteria | 
| startcost | Initialize a Distance Matrix. | 
| tighten | Tightening an Observational Block Design | 
| tightenBlock | Tightens an Observational Block Design by Balanced Subset Matching |