Once a title has had estimates published on a 6 or 12-month base, the period on which subsequent estimates are based may change, as follows:
•From 6 to 12 months
Estimates for a title on a 6-month base will cease to be released if the title’s unweighted AIR respondent count falls below 175 for 2 consecutive 6-month periods, this 12-month period ending in June. 12-month estimates will continue to be released.
•From 12 to 24 months
Estimates for a title on a 12-month base will cease to be released, and be replaced by estimates on a 24-month base, if the title’s 12-month unweighted AIR respondent count falls below 175 for 2 consecutive 12-month periods, this 24-month period ending in June.
In all cases the media list will be reviewed each year when data to June becomes available, and the above changes will be made where appropriate.
