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  The dataset is intended to help researchers quickly identify methodological characteristics of this set of studies.
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  ## File Format and Structure
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  - **File Format:** The data is provided in a tab-separated values (TSV) file, with a header row followed by one row per article.
 
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  The dataset is intended to help researchers quickly identify methodological characteristics of this set of studies.
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+ ## Relevant Literature
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+ King, Gary, and Richard Nielsen. "Why propensity scores should not be used for matching." _Political Analysis_ 27, no. 4 (2019): 435-454.
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  ## File Format and Structure
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  - **File Format:** The data is provided in a tab-separated values (TSV) file, with a header row followed by one row per article.