a branch of applied mathematics concerned with the collection and interpretation of quantitative data and the use of probability theory to estimate population parameters

the use of statistical correlation to evaluate the strength of the relations between variables

any correlation in which the rates of change of the variables is not constant

a correlation between two variables when the effects of one or more related variables are removed

a correlation in which large values of one variable are associated with large values of the other and small with small; the correlation coefficient is between 0 and +1

a correlation in which large values of one variable are associated with small values of the other; the correlation coefficient is between 0 and -1

a correlation between two variables (e.g., between the number of electric motors in the home and grades at school) that does not result from any direct relation between them (buying electric motors will not raise grades) but from their relation to other variables

the use of statistical correlation to evaluate the strength of the relations between variables