theilsU

Introduced in: v22.1

The theilsU function calculates the Theil's U uncertainty coefficient, a value that measures the association between two columns in a table. Its values range from −1.0 (100% negative association, or perfect inversion) to +1.0 (100% positive association, or perfect agreement). A value of 0.0 indicates the absence of association.

Syntax

theilsU(column1, column2)

Arguments

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

Returned value

Returns a value between -1 and 1. Float64

Examples

Usage example

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

┌────────theilsU(a, b)─┐
│ -0.30195720557678846 │
└──────────────────────┘

theilsU​

theilsU