Due to the reduced size of the evenly split dataset, performing a McNemar's test with Edwards' correction (Edwards 1948) does not allow us to reject the null hypothesis that the two experiments do not derive from the same distribution with 95% confidence (χ 2 = 1.49 giving a 2-tailed p value of 0.22).
over the whole skewed dataset, we find χ 2 = 30.74 giving a 2-tailed p < 0.00001 so we have reason to believe that with a larger evenly-split dataset inte-grating context-based features provides a quantifiable advantage.