Both sides of the story: comparing student-level data on reading performance from administrative registers to application generated data from a reading appBent Sortkær, Emil Smith, David Reimer, Stefan Oehmcke and Ida Gran AndersenEPJ Data Sci., 10 1 (2021) 44DOI: https://doi.org/10.1140/epjds/s13688-021-00300-y