REGR_R2
Returns the coeffient of determination (R-squared) of the regression line.
numeric REGR_R2
(in expr1 any,
in expr2 any);
Description
REGR_R2 returns the coefficient of determination (also called "R-squared" or "goodness of fit")
for the regression. VAR_POP(expr1) and VAR_POP(expr2) are evaluated after the elimination of
null pairs. The return values are:
- NULL if VAR_POP(expr2) = 0
- 1 if VAR_POP(expr1) = 0 and VAR_POP(expr2) != 0
- (CORR(expr1,expr2) * CORR(expt1, expr2)) if VAR_POP(expr1) > 0 and VAR_POP(expr2) != 0
Parameters
expr1 –
Number expression.
expr2 –
Number expression.
Return Types
The function returns a value of type NUMERIC. If the function is applied to an empty set, then it
returns null.