![]() It refers to the measuring procedure rather than to the attribute being measured. Reliability: A measure of how dependably an observation is exactly the same when repeated. Lack of validity is referred to as ‘ Bias‘ or ‘ systematic error‘. Internal validity: Are the results valid for the study subjects?Įxternal validity (Generalizability): Are the results valid for the population from which the sample was drawn? Simply put: Are the values describing what was supposed to be measured? For instruments like questionnaires, reliability ensures that responses are consistent across times and occasions. It involves convergent validity when two tests measuring different things yield similar results content validity when items on a test are relevant and meaningful for measuring a particular trait criterion validity when scores on a test match. Validity: The extent to which the study measures what it is intended to measure. The term reliability in psychological research refers to the consistency of a quantitative research study or measuring test. The path of construct validity is one that requires careful consideration and exploration. Lack of precision is referred to as ‘ random error‘. Simply put: How close the measurements are to each other ![]() ![]() Precision: The degree of resemblance among study results, were the study to be repeated under similar circumstances. Simply put: How close a measurement is to the true value In public health the terms accuracy, precision, validity and reliability mean the following:Īccuracy: The degree to which a measurement represents the true value of something. ![]()
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