How to stratify data in Excel
Features
A simple procedure for stratifying data in Excel:
Select the menu item "data stratification" .
Select the Excel work book
Select the work sheet
Select the work sheet
Select the column of interest - i.e. data to be stratified.
Specify the stratification values to be used
Click the "Run" button to produce the chart.
Note there is also a text file produced that can be pasted into Excel to see the results as text. There is no charge for the software - it may be used for any purpose, including commercial and educational.
More info is available.