Reliability Validity
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Reliability, validity and correlation are concepts easy to confuse because the numbers used to represent them are so similar. This is because correlation is often used as a way to measure reliability and validity.
Reliability : Reliability is one indication of how good a measuring tool is. Reliability refers to the consistency of measurement. Reliability is a complex task in that it refers to at least two different concepts namely a) internal consistency and b) consistency across time.
a) Internal Consistency: Internal consistency in measurement refers to whether all aspects of the measurement are measuring the same thing. For example, if we administer 20 questions on a measure of "interpersonal openness", the reliability of the measure is the degree to which all 20 questions are measuring the same concept. At times internal consistency referred to as homogeneity. Example for this is homogenized milk. Milk straight from the cow, if allowed to stand, easily separates into cream and milk...