Symmetric Trimmed Mean Calculator
Average observations after removing a specified fraction from each sorted tail.
Your result
MATHEnter your values and select calculate.
On this page How it works & practical examples
How to use the Symmetric Trimmed Mean Calculator
The percentage applies separately to each tail. Counts round downward and equal values are sorted normally; at least one observation remains.
The calculation
Worked example
Removing one observation at each end of 1,2,3,4,100 leaves 2,3,4 with a mean of 3.
Assumptions and limits
This changes the estimand and does not prove that excluded observations are errors. Small samples may remove no observations at modest trim percentages.
Common questions
Which inputs should I use?
The percentage applies separately to each tail. Counts round downward and equal values are sorted normally; at least one observation remains.
What does the result exclude?
This changes the estimand and does not prove that excluded observations are errors. Small samples may remove no observations at modest trim percentages.