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. 2015 May 21;112(23):E2983. doi: 10.1073/pnas.1502909112

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Fig. 1. — (A) Distribution of happiness values for LIWC function words. The vertical red line shows the median of the distribution. (B) Distributions and medians of happiness values for English in Dodds et al. (1) (red) and in the reference lexicon (3) (blue). (C) Robust regression estimates and confidence intervals of α when using logarithm frequency in Google Books since 1990 instead of a rank transformation for English (EN), Spanish (ES), French (FR), Chinese (CN), Russian (RU), and German (DE).