REGR_SXX
Returns the sum of squares of the difference between the independent expression (expression2) and its average.
That is, REGR_SXX returns: ∑[(expression2 - average(expression2)(expression2 - average(expression2)]
The return value is of type DOUBLE PRECISION
. REGR_SXX
eliminates expression pairs where either expression in the pair is NULL
. If no rows remain, REGR_SXX
returns NULL
.
Syntax
SELECT REGR_SXX ( expression1, expression2 )
Parameters
expression1 |
The dependent DOUBLE PRECISION expression
|
expression2 |
The independent DOUBLE PRECISION expression
|
Example
=> SELECT REGR_SXX (Annual_salary, Employee_age) FROM employee_dimension; REGR_SXX ------------ 2254907.59 (1 row)