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definition of error
definition of error
Error in measurements can defined as difference between the actual value of a quantity and the value that have been obtained by a measurement such as mass. By repeating the measurement on a certain quantity, it will reduce the random error by taking the average of the measurements taken.
There is no instrument that can take a perfect measurement.
The true value in measurements relates to the concepts of reliability and validity. However, the true value is very hard to get. There will be always some different on repeated measurements value either smaller or larger. This difference can be express as a percentage error or absolute error.
Absolute error can be defined as the difference between the expected value of the variable and measured of the variable. Meanwhile, relative error is to express as a percentage.
However, accuracy also can be express in absolute or percentage.
Accuracy can be described as the degree of exactness of a measurement compared to the expected value, or the most probable vale, of the variable being measured.
Precision is more frequently used term to express measurement in terms of relative accuracy rather than error.
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