cramersVBiasCorrected

Calculates Cramer’s V, but uses a bias correction.

cramersVBiasCorrected

Introduced in: v22.1.0

Cramer’s V is a measure of association between two columns in a table. The result of the cramersV function ranges from 0 (corresponding to no association between the variables) to 1 and can reach 1 only when each value is completely determined by the other. The function can be heavily biased, so this version of Cramer’s V uses the bias correction.

Syntax

cramersVBiasCorrected(column1, column2)

Arguments

• column1 — First column to be compared. Any
• column2 — Second column to be compared. Any

Returned value

Returns a value between 0 (corresponding to no association between the columns’ values) to 1 (complete association). Float64

Examples

Comparison with regular cramersV

Query

SELECT
    cramersV(a, b),
    cramersVBiasCorrected(a, b)
FROM
    (
        SELECT
            number % 10 AS a,
            number % 4 AS b
        FROM
            numbers(150)
    );

Response

┌─────cramersV(a, b)─┬─cramersVBiasCorrected(a, b)─┐
│ 0.5798088336225178 │          0.5305112825189074 │
└────────────────────┴─────────────────────────────┘