# rankCorr

Computes a rank correlation coefficient.

Syntax

``````rankCorr(x, y)
``````

Arguments

Returned value(s)

• Returns a rank correlation coefficient of the ranks of x and y. The value of the correlation coefficient ranges from -1 to +1. If less than two arguments are passed, the function will return an exception. The value close to +1 denotes a high linear relationship, and with an increase of one random variable, the second random variable also increases. The value close to -1 denotes a high linear relationship, and with an increase of one random variable, the second random variable decreases. The value close or equal to 0 denotes no relationship between the two random variables.

Type: Float64.

Example

Query:

``````SELECT rankCorr(number, number) FROM numbers(100);
``````

Result:

``````┌─rankCorr(number, number)─┐
│                        1 │
└──────────────────────────┘
``````

Query:

``````SELECT roundBankers(rankCorr(exp(number), sin(number)), 3) FROM numbers(100);
``````

Result:

``````┌─roundBankers(rankCorr(exp(number), sin(number)), 3)─┐
│                                              -0.037 │
└─────────────────────────────────────────────────────┘
``````