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
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