Table 3.

Cross-corpora comparison experiment.

Dimension	Abstract, title, and keyword	Abstract alone	Title and keyword	Title alone	Keyword alone
Behavioral domain	0.534	0.537	0.501	0.440	0.448
Cognitive paradigm class	0.464	0.464	0.471	0.420	0.394
Instruction type	0.534	0.538	0.498	0.488	0.456
Response modality	0.745	0.744	0.731	0.710	0.694
Response type	0.706	0.720	0.699	0.660	0.662
Stimulus modality	0.815	0.814	0.794	0.770	0.805
Stimulus type	0.496	0.478	0.470	0.410	0.430

Table presents F₁-micro values (see text) for naive Bayes under the binary relevance transformation across the five corpora that vary the feature space: words from (1) abstracts, titles, and MeSH keywords; (2) words from abstract text alone; (3) words from both titles and MeSH keywords; (4) title words alone; (5) MeSH keywords alone. Highest F₁-micro highlighted in boldface; this does not indicate statistical significance. See text for details.