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#Statistical

TRIMMEAN

Excel Functions

Calculate mean excluding outliers

Syntax

EXCEL 
=TRIMMEAN(array, percent)

Arguments

Parameter Description
array Values to trim and average.
percent The number of data points to exclude from the calculation.

Return Value

Calculated mean

Details

The Excel TRIMMEAN function calculates mean (average) while excluding outliers. The number of data points to exclude is provided as a percentage. TRIMMEAN works by first excluding values from the top and bottom of a data set, then calculating mean. The number of data points is provided as a percentage. The percentage can be input either in decimal format or percent format: It's important to note that TRIMMEAN rounds excluded data points down to the nearest multiple of 2. For example, with 50 data points, 10% equals 5 values. In this case, TRIMMEAN will round 5 down to 4, then exclude two values from the top, of the data set, and two values from the bottom of the data set.

Examples

Example 1

TRIMMEAN works by first excluding values from the top and bottom of a data set, then calculating mean. The number of data points is provided as a perc

EXCEL 
=TRIMMEAN(A1:A100,0.1) // exclude 10%
=TRIMMEAN(A1:A100,10%) // exclude 10%
=TRIMMEAN(A1:A100,0.2) // exclude 20%
=TRIMMEAN(A1:A100,20%) // exclude 20%

See Also

AVERAGE AVERAGEIF MODE