Open-Access-Statistics (OAS)

OAS has implemented an infrastructure to collect and exchange usage information between different services (e.g. open access repositories, licence servers, linkresolvers) and to process this information according to the standards of COUNTER, LogEc and IFABC. This allows comparing hits from different services. The OAS infrastructure is two-fold: First the data providers generate logs about document usage and pseudonymize user information (e.g. IP addresses). In the following step they process usage information (add a unique document ID, transforms data into OpenURL ContextObjects etc.) and finally offer the information via OAI-PMH. Second, the central service provider collects the usage events from each single data provider and processes this data. It deduplicates documents (e.g. it sums up the hits to files with the same content on different servers) and also deduplicates users, so it is possible to create download graphs or to conduct clickstream analysis. It also processes the data according to the three standards mentioned beforehand (including the removal of non-human access and considering standard-specific parameters like double-click spans). After the calculation the usage data will be retransferred to the distributed services (the data providers) and to the Open Access Network service.