WorksheetFunction.TrimMean(Object, Double) Method
Definition
Important
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Returns the mean of the interior of a data set. TRIMMEAN calculates the mean taken by excluding a percentage of data points from the top and bottom tails of a data set. You can use this function when you wish to exclude outlying data from your analysis.
public:
double TrimMean(System::Object ^ Arg1, double Arg2);public double TrimMean (object Arg1, double Arg2);Public Function TrimMean (Arg1 As Object, Arg2 As Double) As DoubleParameters
- Arg1
- Object
Array - the array or range of values to trim and average.
- Arg2
- Double
Percent - the fractional number of data points to exclude from the calculation. For example, if percent = 0.2, 4 points are trimmed from a data set of 20 points (20 x 0.2): 2 from the top and 2 from the bottom of the set.
Returns
Remarks
If percent < 0 or percent > 1, TrimMean returns the #NUM! error value.
TrimMean rounds the number of excluded data points down to the nearest multiple of 2. If percent = 0.1, 10 percent of 30 data points equals 3 points. For symmetry, TrimMean excludes a single value from the top and bottom of the data set.