default.vw_pin_history currently has one class column, but values for three stages. Since class can change between stages, this makes it impossible to know whether a stage's values should be excluded from a ratio study, if SOPs were to dictate such exclusions.
default.vw_pin_historycurrently has oneclasscolumn, but values for three stages. Since class can change between stages, this makes it impossible to know whether a stage's values should be excluded from a ratio study, if SOPs were to dictate such exclusions.