regr_slope
aggregate function
Applies to: Databricks SQL Databricks Runtime
Returns the slope of the linear regression line in a group where xExpr
and yExpr
are NOT NULL
.
Syntax
regr_slope( [ALL | DISTINCT] yExpr, xExpr) [FILTER ( WHERE cond ) ]
This function can also be invoked as a window function using the OVER
clause.
Arguments
yExpr
: A numeric expression, the dependent variable.xExpr
: A numeric expression, the independent variable.cond
: An optional Boolean expression filtering the rows used for the function.
Returns
A DOUBLE
.
Any nulls within the group are ignored. If a group is empty or consists only of nulls, the result is NULL
.
If DISTINCT
is specified, the average is computed after duplicates are removed.
Examples
> SELECT regr_slope(y, x) FROM VALUES (1, 2), (2, 3), (2, 3), (null, 4), (4, null) AS T(y, x);
.333333