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A '''Surrogate measure''' is a measurement taken with the intent to gain insight into a variable that is either impractical to measure directly, or in principle impossible to measure. [[GDP]] per capita or [[PPP]] are common economic measures that have little meaning in and of themselves but provide insight into the wealth of a nation. In medicine a surrogate outcome measure such as the color of the lips and fingernail beds may be used to inexpensively and non-invasively judge the outcome of a heart surgery.
