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1.4 KiB
1.4 KiB
slug | sidebar_position |
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/en/sql-reference/aggregate-functions/reference/contingency | 350 |
contingency
The contingency
function calculates the contingency coefficient, a value that measures the association between two columns in a table. The computation is similar to the cramersV
function but with a different denominator in the square root.
Syntax
contingency(column1, column2)
Arguments
column1
andcolumn2
are the columns to be compared
Returned value
- a value between 0 and 1. The larger the result, the closer the association of the two columns.
Return type is always Float64.
Example
The two columns being compared below have a small association with each other. We have included the result of cramersV
also (as a comparison):
SELECT
cramersV(a, b),
contingency(a ,b)
FROM
(
SELECT
number % 10 AS a,
number % 4 AS b
FROM
numbers(150)
);
Result:
┌──────cramersV(a, b)─┬───contingency(a, b)─┐
│ 0.41171788506213564 │ 0.05812725261759165 │
└─────────────────────┴─────────────────────┘