COFECHA Output (crossdating quality analysis)

COFECHA is a quality-control program used to check the crossdating and overall quality of tree-ring chronologies. A modified form of COFECHA has been run on the chronologies in the ITRDB, during two quality-control projects completed in 1996 and 2005, respectively. The COFECHA output file for each chronology provides important information about chronology quality. The online user guide will aid in the interpretation of that information.

The name of each COFECHA output file is the sitecode of the associated chronology. For example, the Mohonk Lake chronology in New York is ny003 (ny003.crn, ny003.rwl), so the COFECHA output file is ny003.txt.