Compute trimmed mean of column 4 grouped by column 3
Applies the 10 percent trimmed mean to column 4 separately for each group found in column 3. Per-group trimmed means are useful when some groups contain outlier values that would skew a plain average. The grouping flag -g works with every datamash operation, not just this one. Results are one row per group, in first-seen order unless -s is added.
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