regr_slope aggregate function (Databricks SQL)

Returns the slope of the linear regression line a group where xExpr and yExpr are NOT NULL.

Syntax

regr_slope( [ALL | DISTINCT] yExpr, xExpr) [FILTER ( WHERE cond ) ]

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