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Blocked Solomon Four-Group Design

The blocked Solomon four-group design combines Solomon's classic four-group structure — which disentangles pretest sensitization effects from treatment effects — with blocking on a known nuisance variable. Participants are first grouped into homogeneous blocks (e.g., by baseline ability, gender, or site), then randomly assigned within each block to one of four conditions: pretested treatment, pretested control, unpretested treatment, and unpretested control. This structure simultaneously controls for maturation, pretest reactivity, and block-level variance, making it one of the strongest quasi-controlled experimental frameworks available.

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Blocked Solomon Four-Group Experimental Design

Registre de mètode taxonòmic · process-pipeline / experimental-design

Solomon, R. L. (1949). An extension of control group design. Psychological Bulletin, 46(2), 137–150. · DOI 10.1037/h0062958
Kirk, R. E. (2013). Experimental Design: Procedures for the Behavioral Sciences (4th ed.). Sage Publications. · ISBN 978-1412974455

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Taxonomic bucketBlocked Randomized Controlled Trialmachine-suggested · Relational suggestion, not evidence.Taxonomic bucketControl Group Experimental Designmachine-suggested · Relational suggestion, not evidence.Taxonomic bucketFactorial Experimentmachine-suggested · Relational suggestion, not evidence.Taxonomic bucketPretest-Posttest Experimental Designmachine-suggested · Relational suggestion, not evidence.Used in the same domainRandomized Controlled Trialmachine-suggested · Relational suggestion, not evidence.Taxonomic bucketSolomon Four-Group Designmachine-suggested · Relational suggestion, not evidence.