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? Validity: The extent to which the study measures what it is intended to measure. 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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