Tracking the spelling performance of disadvantaged primary- and middle-school students enrolled on an innovative cross-grade program: Variations according to the nature of spelling errors considered

Data set about the number of spelling errors (phonological, orthographical and morphological) produced in both 2020-2021 and 2021-2020 by students who enrolled on an innovative cross-grade program in a disadvantaged neighborhood. The second year their spelling performance have been compared to those of control's students from the same disadvantaged neighborhood but who not enrolled on the innovative program.