Figure 1.

The stability of typological features. (a) Boxplot of scores of binary features on PC₁ (overall stability ranging from the most stable on the bottom to the most unstable on top) by feature type (sorted by increasing median stability), and significant differences after Tukey's HSD. (b) Scatterplot of binary features on the average rank of the corresponding polymorphic feature versus the average rank of the binary features, with their regression line. Black triangle, features of type Word Order; white circle, Phonology; white triangle, Nominal Syntax; black circle, Morphology; white square, Verbal Categories; black square, Nominal Categories; cross, Simple Clauses; and ‘all’, all types of features combined.