I read this fairly carefully and did not see any suggestion that D could correlate with grammar. It may be that the rating of the essay resulted more from grammar and spelling and that D is correlated to that.
Yeah I mean the thing about all of this stuff is that there are so many lurking confounds and undescribed variables. The thing is that there's stuff we can automate reading of and stuff we can't, currently, so you get a lot of study designs basically fitting the available tools.
I read this fairly carefully and did not see any suggestion that D could correlate with grammar. It may be that the rating of the essay resulted more from grammar and spelling and that D is correlated to that.
Yeah I mean the thing about all of this stuff is that there are so many lurking confounds and undescribed variables. The thing is that there's stuff we can automate reading of and stuff we can't, currently, so you get a lot of study designs basically fitting the available tools.