144 Ethnic sorting in football Utrecht University. These data were only accessed for the purpose of matching them with the microdata of Statistics Netherlands via a secure upload portal. The matched dataset is stored within the secured network of Statistics Netherland. The researcher was the sole person that was able to access these data. This was done by using a computer on the site of Statistics Netherlands in The Hague or remotely through a secure multi-factor authentication process that requires periodic reauthentication. To protect the anonymity of the data, variables used for matching and identifying records as well as member codes and club codes were encrypted by Statistics Netherlands, prior to giving access to the researcher. All data processing and analysis was carried out within the network of Statistics Netherlands, and the records detailing these steps and the study’s results are also stored there. Prior to be released for publication, all results of this dissertation were fist checked independently by two researchers from Statistics Netherland, ensuring no sensitive information would be revealed. Currently all data remain stored with Statistics Netherlands, until the project is terminated. If approved by the KNVB, it is possible to access these data under the conditions set by Statistics Netherlands to review the research. Per agreement with the KNVB, the membership data stored at Utrecht University and Statistics Netherlands will be deleted as soon as they are no longer of use for this PhD project.
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