Unsub modeling uses many parameters, many of which are user-configurable. One of the many parameters we use is turnaways data.
COUNTER 5 includes turnaways data in the TR_J2 file (named "Journal Access Denied").
We include all titles in the TR_J2 file that have data for the metric No_License unless they fall into one of the exceptions explained here.
We include those titles because they are cases of people attempting to access the full-text of an article that were redirected to the abstract.
In Unsub we want to account for what people want to read - regardless of whether they have access to full-text or not. This is why we include turnaways: to better account for everything users want to read.
Note: If you’re using COUNTER 4 we do not count turnaways because they are not included in COUNTER 4. However, if you use COUNTER 5 we do count turnaways