double-blind study → studio in doppio cieco

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double-blind study  → studio in doppio cieco
"Io non odio persona al mondo, ma vi sono cert'uomini ch'io ho bisogno di vedere soltanto da lontano".
Ugo Foscolo - "Ultime lettere di Jacopo Ortis"


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A blind or blinded experiment is a scientific experiment where some of the persons involved are prevented from knowing certain information that might lead to conscious or unconscious bias on their part, invalidating the results.
For example, when asking consumers to compare the tastes of different brands of a product, the identities of the latter should be concealed — otherwise consumers will generally tend to prefer the brand they are familiar with. Similarly, when evaluating the effectiveness of a medical drug, both the patients and the doctors who administer the drug may be kept in the dark about the dosage being applied in each case — to forestall any chance of a placebo effect, observer bias, or conscious deception.

Double-blind describes an especially stringent way of conducting an experiment, usually on human subjects, in an attempt to eliminate subjective bias on the part of both experimental subjects and the experimenters. In most cases, double-blind experiments are held to achieve a higher standard of scientific rigor.


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