This macro calculates the trimmed mean by removing the smallest p% and the largest p% of the values (rounded to the nearest integer), and then averages the remaining values.
Be sure that Minitab knows where to find your downloaded macro. Choose . Under Macro location browse to the location where you save macro files.
If you use an older web browser, when you click the Download button, the file may open in Quicktime, which shares the .mac file extension with Minitab macros. To save the macro, right-click the Download button and choose Save target as.
The percentage must be a positive value greater than 0 and less than 50%. You can specify this percentage as a decimal (10% = 0.10) or as an integer (10% = 10).
Suppose the data are in C1 and you want to calculate a 10% trimmed mean. To run the macro, choose and type:
%TRIMMEAN C1 0.10
Click Run.