Name
REGR_R2 — Returns the coefficient of determination (R-squared) of the regression line.
Synopsis
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.