Abbakumov, DmitryDmitryAbbakumovDesmet, PietPietDesmetVan den Noortgate, WimWimVan den Noortgate2021-10-252021-10-2520182405-8440https://imec-publications.be/handle/20.500.12860/30056Measuring student's proficiency in MOOCs : multiple attempts extensions for the Rasch modelJournal articlehttps://doi.org/10.1016/j.heliyon.2018.e01003