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ClickHouse/docs/en/sql-reference/aggregate-functions/reference/simplelinearregression.md
Simon Podlipsky 677f296214
docs: use k as constant name instead of a in simpleLinearRegression 
Function uses `k` internally.

E.g.

```sql
SELECT arrayReduce('simpleLinearRegression', [0, 1, 2, 3], [0, 1, 2, 3]) FORMAT JsonEachRow
```

outputs `{"arrayReduce('simpleLinearRegression', [0, 1, 2, 3], [0, 1, 2, 3])":{"k":1,"b":0}}`
2024-10-21 15:34:15 +02:00

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simpleLinearRegression

Performs simple (unidimensional) linear regression.

simpleLinearRegression(x, y)

Parameters:

  • x — Column with explanatory variable values.
  • y — Column with dependent variable values.

Returned values:

Constants (k, b) of the resulting line y = k*x + b.

Examples

SELECT arrayReduce('simpleLinearRegression', [0, 1, 2, 3], [0, 1, 2, 3])

┌─arrayReduce('simpleLinearRegression', [0, 1, 2, 3], [0, 1, 2, 3])─┐
│ (1,0)                                                             │
└───────────────────────────────────────────────────────────────────┘

SELECT arrayReduce('simpleLinearRegression', [0, 1, 2, 3], [3, 4, 5, 6])

┌─arrayReduce('simpleLinearRegression', [0, 1, 2, 3], [3, 4, 5, 6])─┐
│ (1,3)                                                             │
└───────────────────────────────────────────────────────────────────┘