Magic Factor

A popular term for any intangible factor that affects the performance of a particular test, making it difficult to obtain consistent results; certain immunoassays—e.g., tissue staining by immunoperoxidase methods—may yield inconsistent results in relatively inexperienced hands, due, some might say, to a ‘magic factor’
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First, I'm one of many shooters who believe there's a certain ballistic "magic factor" in the 6.5 slug, and there's lots of evidence supporting that.
"The magic factor is to support that kind of growth we need to continue the skills provisioning and ensure our children graduate with proper skills that are globally recognised and that we continue to support the professional sector that make the economic growth engine work.