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regression coefficient
when the regression line is linear (y = ax + b) the regression coefficient is the constant (a) that represents the rate of change of one variable (y) as a function of changes in the other (x); it is the slope of the regression line
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coefficient of correlation, correlation, correlation coefficient
a statistic representing how closely two variables co-vary; it can vary from -1 (perfect negative correlation) through 0 (no correlation) to +1 (perfect positive correlation)
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Pearson product-moment correlation coefficient, product-moment correlation coefficient
the most commonly used method of computing a correlation coefficient between variables that are linearly related
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multiple correlation coefficient
an estimate of the combined influence of two or more variables on the observed (dependent) variable
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biserial correlation, biserial correlation coefficient
a correlation coefficient in which one variable is many-valued and the other is dichotomous
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chance-half correlation, split-half correlation
a correlation coefficient calculated between scores on two halves of a test; taken as an indication of the reliability of the test
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tetrachoric correlation, tetrachoric correlation coefficient
a correlation coefficient computed for two normally distributed variables that are both expressed as a dichotomy
