James_Miller comments on N-back news: Jaeggi 2011, or, is there a psychologist/statistician in the house? - Less Wrong

14 Post author: gwern 16 June 2011 06:47PM

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Comment author: James_Miller 17 June 2011 03:19:06AM 3 points [-]

From the study:

Because we included children from both the Detroit and Ann Arbor metropolitan areas, we had a broad range of socioeconomic status, race, and ethnicity

Detroit has some of the worse public schools in the country and Ann Arbor some of the best. Yet, unless I missed it Jaeggi didn't breakdown any of the results by school location. Strange. I wonder which type of students were among those that she claimed benefited from the N-back?

Comment author: gwern 17 June 2011 06:54:41PM 2 points [-]

Table 1's caption includes the line:

There were no significant group differences on any of the pretest measures or the demographic variables.

So presumably they didn't notice any correlations between the obvious demographic variables and performance.

Comment author: James_Miller 17 June 2011 08:13:14PM 0 points [-]

Thanks, you're right.

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