Reliability is also known as repeatability. Reliable measurement gives consistent results in a time duration.increase in random error reduces the reliability. Reliability of instrument creates the upper limit to reliability.
There are three main bases to test reliability of surveys:
• Test-retest: In this method, reliability can be tested by administrating of the instrument to similar people( group ) at two points that are different in time.
• Equivalent form: two different instruments used to measure similar inputs.
• Internal consistency: It is one of the most important methods used to measure reliability.
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