I was computing month-to-month transitions between occupations (different digits as well as major and detailed groups) based on the harmonized OCC2010 variable and noticed a weird spike in June 2015. It jumps to around 7% while between 2005 and today it is usually around 2% or 3%. Also for the rest of the time range (even when there is a new occupation classification e.g. in Jan 2020) no such anomaly is visible. Is this a known issue/due to some reclassification or change in interviewing technique? Any help would be greatly appreciated.
I would attach the figure for the month-to-month transition rates for 10 major occupation groups but I’m not allowed to as a new user.