Ethnic classification is an inherently subjective process, especially when multiple ethnic
identifications are involved. There are two methods commonly used to classify multiple
ethnicities into single categories: administrative-prioritisation (assignment via a
predetermined hierarchy) and self-prioritisation (where individuals select their “main”
ethnicity). Currently, little is known about whether the demographic composition of outputted
ethnic groups differs by prioritisation method. This study utilised large-scale data of multi …