PDM research requires variation in disease and production situations → several fields (locations x years) n > 50? Context for BIG! Source: grupocultivar.com.br
Common treatments (fungicide, biocontrol, etc.) Chemicals from several industries (control bias?) New treatments added over years, some are kept Disease and yield data are obtained The uniform trials (network)
approach: how many P < 0.05 When combined, same weight is assigned to trials "Not good" trials are eliminated from analysis By tradition in academic research