Manuals/calci/TRIMMEAN

TRIMMEAN(ar,p)

• $ar$ is the array of values to find trim and average .
• $p$ is the fractional number of data points.

Description

• This function gives the truncated mean of a given set of points.
• Trimmean is a measure of mean that indicates the central tendancy of a set of values.
• Trimmean is also called truncated mean.
• It is the method of finding average that removes a small percentage of the largest and smallest values before calculating the mean.
• In $TRIMMEAN(ar,p)ar$ is the array of values to calculate the trimmed mean.p is the fractional number that we want to remove from the given set of numbers.
• For e.g., if p=0.2 for the 20 points data set, then to calculate the $TRIMMEAN$ it will exclude 4 points(20*0.2) from the data set, 2 numbers from lowest value and 2 numbers from highest value.
• Also this function rounds the number of excluded data points down to the nearset multiple of 2.
• If p=0.1 for the 30 points data set, then it should exclude (30*0.1) 3 points from the data set. But it will remove one number from top and one number from bottom, so it will exclude only 2 numbers instead of 3 numbers.

      This function will give the result as error when p<0 or p>1

Examples

Spreadsheet

	A	B	C	D	E	F	G	H	I	J	K	L
1	14	18	21	19	20	23	8	10	7	18	12	11

1. =TRIMMEAN(A1:L1,0.2) = 15.1
2. =TRIMMEAN(A1:L1,0.4) = 15.25
3. =TRIMMEAN(A1:L1,0.1) = 15.083333333333334
4. =TRIMMEAN(A1:L1,0) = 15.083333333333334

See Also

• AVERAGE
• GEOMEAN
• HARMEAN
• MEDIAN