Fig 1.
Correlation between the level of the population size and the level of the type-token ratio for eight languages (including two varieties of English).
Orange circles: raw data. Blue line: linear prediction of the type-token ratio on the population size. Notes on the bottom right: Pearson correlation (all ps < .05 or better, except for Chinese where p = .89).
Fig 2.
Correlation between the level of the annual global mean seal level and the level of the type-token ratio for eight languages (including two varieties of English).
Orange circles: raw data. Blue line: linear prediction of the type-token ratio on the population size. Notes on the bottom right: Pearson correlation (all ps < .001 except for Chinese were p = 0.95 and Russian where p = .10)
Fig 3.
Type-token ratio as a function of time for eight languages (including two varieties of English).
Orange lines: raw data. Blue lines: simple weighted moving average with an 11-year window centered on the current value.
Fig 4.
Correlations between the annual global mean seal level and 10,000 simulated random walks with drift.
Top: Histogram of the correlations between levels. Bottom: Histogram of the correlation between year-to-year changes. The height of the bars in both histograms represents the number of cases in the category. Blue lines: scaled normal density.
Fig 5.
Correlations of current and lagged residuals of a regression of the 10,000 simulated random walks with drift on the annual global mean seal level.
Top: Histogram for levels. Bottom: Histogram for year-to-year changes. The height of the bars in both histograms represents the number of cases in the category. Blue lines: scaled normal density.