Sample designs of 838 articles published in 1990, 2000, and 2010.

Name: Sample designs of 838 articles published in 1990, 2000, and 2010.
Published: 2015-10-08T00:00:00+08:00

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*Chi-square test for differences among years. Sample designs of 838 articles published in 1990, 2000, and 2010.

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2015-10-08