AI2D-RST: A multimodal corpus of 1000 primary school science diagrams
Table 2: Class-wise marginal κ scores for macro-groups
['Macro-group', '[ITALIC] κ', 'z-score', 'p-value', 'Frequency in the entire corpus']
The values are considerably lower for less common macro-groups such as tables and photographs. Photographs, in particular, are rarely preferred as the main visual mode of expression in the AI2D-RST corpus, as diagrams in the corpus favour illustrations, cut-outs and cross-sections for visual expression. For these prominent macro-groups, agreement remains substantial.