Seasonally adjusted data
Removing regular patterns, such as summer jobs, to see the underlying trend.
Many monthly and quarterly statistics follow the calendar: tourism jobs rise in summer, retail sales rise before holidays. Seasonal adjustment removes these regular patterns.
Adjusted figures can be compared month to month. Unadjusted figures should be compared with the same month a year earlier.
Seasonally adjusted series are revised as new data arrive, so recent values can change.