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REGR_SLOPE

Description​

REGR_SLOPE is used to calculate the slope of the least squares-fit linear equation for a set of number pairs.

Syntax​

REGR_SLOPE(y, x)

Parameters​

  • y (Numeric): The dependent variable.
  • x (Numeric): The independent variable.

Both x and y support basic numeric types.

Returned values​

Returned data type: FLOAT64

The function returns the slope of the linear regression line.

If there are no rows, or only rows with null values, the function returns NULL.

Examples​

-- Example 1: Basic Usage
SELECT regr_slope(y, x) FROM test;

-- Example 2: Usage in a query with sample data
SELECT * FROM test;
+------+------+------+
| id   | x    | y    |
+------+------+------+
|    1 |   18 |   13 |
|    3 |   12 |    2 |
|    5 |   10 |   20 |
|    2 |   14 |   27 |
|    4 |    5 |    6 |
+------+------+------+

SELECT regr_slope(y, x) FROM test;
+--------------------+
| regr_slope(y, x)   |
+--------------------+
| 0.6853448275862069 |
+--------------------+

Usage notes​

  • This function ignores any pair where either value is null.
  • In cases where the calculation would result in a division by zero, the function will return NULL.

REGR_INTERCEPT, REGR_R2, REGR_COUNT, REGR_AVGX, REGR_AVGY

References​

For more details about linear regression functions, please refer to the SQL standard documentation on aggregate functions.