![]() ![]() This correlation denotes the extent to which the raw scores rise over time.Įspecially when it comes to selection purposes, robustness is the single most important quality of a test. An experimental measure of robustness which I will use in the following years is based on the correlation between the chronological ranks (or test dates) of test submissions and the raw scores of those submissions. I have not had a good measure of robustness until now, and have therefore not studied it in detail yet. Robustness is a test's resistance to score inflation through whatever cause practice effects, fraud, answer leakage, increasing quality of research materials like the Internet, unauthorized publication and so on. More detailed explanations of many test statistics are in the section Statistics explained. ![]() A brief explanation of the three statistics follows. In addition, there is a quality of tests which I call "robustness", and which I find even more important than either validity or reliability, especially with regard to selection purposes. In short, validity consists of correlations between the test and the world outside it, while reliability consists of correlations within the test. The quality of a test is traditionally reflected in two statistics called validity and reliability. ![]()
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