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SQL Anywhere 11.0.1 (Français) » SQL Anywhere Server - SQL Reference » Using SQL » SQL functions » SQL functions (P-Z)


REGR_R2 function [Aggregate]

Computes the coefficient of determination (also referred to as R-squared or the goodness of fit statistic) for the regression line.

Syntax 1
REGR_R2( dependent-expression , independent-expression )
Syntax 2
REGR_R2( dependent-expression , independent-expression ) 
OVER ( window-spec )
window-spec : see Syntax 2 instructions in the Remarks section below
  • dependent-expression   The variable that is affected by the independent variable.

  • independent-expression   The variable that influences the outcome.




This function converts its arguments to DOUBLE, and performs the computation in double-precision floating point. If the function is applied to an empty set, then it returns NULL.

The function is applied to the set of (dependent-expression and independent-expression) pairs after eliminating all pairs for which either dependent-expression or independent-expression is NULL.

For more information about the statistical computation performed, see Mathematical formulas for the aggregate functions.

Syntax 2 represents usage as a window function in a SELECT statement. As such, elements of window-spec can be specified either in the function syntax (inline), or in conjunction with a WINDOW clause in the SELECT statement. See the window-spec definition provided in WINDOW clause.

For more information about using window functions in SELECT statements, including working examples, see Window functions.

See also
Standards and compatibility
  • SQL/2003   SQL foundation feature (T621) outside core SQL.


The following example returns the coefficient of determination for the regression line.

SELECT REGR_R2( Salary, ( YEAR( NOW( )) - YEAR( BirthDate ) ) )
FROM Employees;