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What is "double-blind"

Longman Dictionary of Contemporary English
double-blind
adjective
EXAMPLES FROM CORPUS
▪ Convincing them otherwise would take double-blind trials and a plausible explanation of how the sensitivity might arise.
▪ One study did not use a double-blind design and was therefore excluded from the analysis.
▪ To eliminate this, as in double-blind trials, would in many cases render the therapy impotent.
Wiktionary
double-blind

a. Describing an experiment (usually medical) in which the identity of those conducting the test(s) is kept secret from both the subjects and the administrators until the outcome of the experiment is known. alt. Describing an experiment (usually medical) in which the identity of those conducting the test(s) is kept secret from both the subjects and the administrators until the outcome of the experiment is known.

Usage examples of "double-blind".

Double-blind implant the little angels in mothers chosen at random from the Embryadopt lists all income levels, all education and intelligence levels, all races.

We even built a prototype before Caliban, a sessile testbed unit, and gave it to Gubber to test in a double-blind setup.

An examination of sixteen studies that they found to have adequate double-blind designs showed a relatively large effect size, with an overall significance of 1 in 10,000 for 2,139 patients.

I got the job details and my up-front money through a double-blind courier service, no trace possible on who sent them my way.