Figure 1.

Harmonization workflow diagram

Pre-statistical harmonization begins with cataloging data from the datasets to be harmonized. Decisions on how to harmonize categorical and continuous data are made in collaboration with the research team. The harmonization sheet can be used to record all harmonization instructions; the harmonization sheet then serves as primary input into the harmonization() function in the psHarmonize R package. Long and wide harmonized datasets are created, and summary reports are generated for viewing results.