regr_syy aggregate function (Databricks SQL)

Returns the sum of squares of the yExpr values of a group where xExpr and yExpr are NOT NULL.

Requires: SQL warehouse version 2022.25 or higher. This version is available in the Preview channel.

Syntax

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

Arguments

  • yExpr: An numeric expression, the dependent variable.

  • xExpr: An numeric expression, the independent variable.

  • cond: An optional boolean expression filtering the rows used for the function.

Returns

The result type is 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 result is computed after duplicates are removed.

regr_syy(y, x) is a synonym for regr_count(y, x) * var_pop(y).

Examples

> SELECT regr_syy(y, x) FROM VALUES (1, 2), (2, 3), (2, 3), (null, 4), (4, null) AS T(y, x);
  0.6666666666666666