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.
Suppose the first interval of a histogram of your data in C1 has a midpoint of 20.5, the final interval of your histogram has a midpoint of 40.5, and the increment between the midpoints is 2.To run the macro, choose and type:
%HBINS 20.5 40.5 2 C1
Click Run.
As with MINITAB's histogram algorithm, observations that fall on interval boundaries are put into the interval to the right, with one exception: observations on the boundary of the interval that is farthest to the right are put in the final interval.