2 DATA  
2.1 Cluster and Weak Lensing Catalogs  
2.2 Cluster Number Counts Data  
2.3 Weak Lensing Cluster Masses  
3 THEORY AND METHODS  
3.1 Expectation Values  
3.2 Mass-Function Systematics  
3.3 Covariance Matrix  
4 VALIDATION TESTS  
5 BLINDING AND UNBLINDING  
6 RESULTS  
6.1 SDSS Cluster Abundances and Weak Lensing Data  
6.2 Robustness to Assumptions About the Richness–Mass Relation  
6.3 The Observable–Mass Relation for redMaPPer Clusters  
7 COMPARISON TO EXTERNAL DATA SETS  
8 SUMMARY AND CONCLUSION