The Accuracy of a measurement system is defined as the degree of closeness of measurements of a quantity to that quantity’s actual (true) value. The precision of a measurement system, also called
reproducibility or repeatability is the degree to which repeated measurements under unchanged conditions show the same results.
Repeatability is the variation arising when all efforts are made to keep conditions constant by using the same instrument and operator, and repeating during a short time period.
Reproducibility is the variation arising using the same measurement process among different instruments and operators, and over longer time periods.
No.
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Accuracy
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Precision
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1
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It is closeness with the true value of
the quantity being measured.
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It is a measure of the reproducibility
of the measurement.
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2
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The accuracy of measurement means
conformity to truth.
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The term precise means clearly or
sharply defined.
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3
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Accuracy can be improved.
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Precision cannot be improved.
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4
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Accuracy depends upon simple
techniques of analysis.
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Precision depends upon many factors
and requires many sophisticated techniques of analysis.
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5
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Accuracy is necessary but not sufficient
condition for precision.
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Precision is necessary but not a
sufficient condition for accuracy.
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