# parametric statistic

Definitions of parametric statistic
1. noun
any statistic computed by procedures that assume the data were drawn from a particular distribution
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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
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)
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
multiple correlation coefficient
an estimate of the combined influence of two or more variables on the observed (dependent) variable
biserial correlation, biserial correlation coefficient
a correlation coefficient in which one variable is many-valued and the other is dichotomous
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
tetrachoric correlation, tetrachoric correlation coefficient
a correlation coefficient computed for two normally distributed variables that are both expressed as a dichotomy
type of:
statistic
a datum that can be represented numerically
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