Datapoints: salary changes among independent psychologists by gender and experience.
Williams
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Kohout
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Wicherski
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D003625:Data Collection; D005260:Female; D006801:Humans; D008297:Male; D011361:Professional Competence; D011584:Psychology / Q000191:economics*; D012456:Salaries and Fringe Benefits / Q000706:statistics & numerical data*; D012737:Sex Factors; D014481:United States