# avgWeighted

Calculates the weighted arithmetic mean.

Syntax

``avgWeighted(x, weight)``

Arguments

• `x` β Values.
• `weight` β Weights of the values.

`x` and `weight` must both be Integer, floating-point, or Decimal, but may have different types.

Returned value

• `NaN` if all the weights are equal to 0 or the supplied weights parameter is empty.
• Weighted mean otherwise.

Return type is always Float64.

Example

Query:

``SELECT avgWeighted(x, w)FROM values('x Int8, w Int8', (4, 1), (1, 0), (10, 2))``

Result:

``ββavgWeighted(x, weight)βββ                      8 βββββββββββββββββββββββββββ``

Example

Query:

``SELECT avgWeighted(x, w)FROM values('x Int8, w Float64', (4, 1), (1, 0), (10, 2))``

Result:

``ββavgWeighted(x, weight)βββ                      8 βββββββββββββββββββββββββββ``

Example

Query:

``SELECT avgWeighted(x, w)FROM values('x Int8, w Int8', (0, 0), (1, 0), (10, 0))``

Result:

``ββavgWeighted(x, weight)βββ                    nan βββββββββββββββββββββββββββ``

Example

Query:

``CREATE table test (t UInt8) ENGINE = Memory;SELECT avgWeighted(t) FROM test``

Result:

``ββavgWeighted(x, weight)βββ                    nan βββββββββββββββββββββββββββ``