Please Note: This article is written for users of the following Microsoft Excel versions: 2007, 2010, and 2013. If you are using an earlier version (Excel 2003 or earlier), this tip may not work for you. For a version of this tip written specifically for earlier versions of Excel, click here: Calculating Statistical Values on Different-Sized Subsets of Data.
by Allen Wyatt
(last updated January 24, 2018)
Chris has a huge amount of data in a worksheet and he wants to analyze the data based on different groupings within it. For instance, he has data in cells A2:B36001, where row 1 contains the column headings Time and Signal. He wants to divide the data into groups consisting of some arbitrary number of sequential values, and then extract, for each group, a mean value for the Time, a mean value for the Signal, and a standard deviation for the Signal.
The easiest way to handle this type of requirement is to add a column that is used to indicate a group number for each row. Follow these steps:
With the group numbers set up, you are ready to do the analysis. There are a couple of ways you can do this. One way is to use the subtotaling capabilities of Excel. Select one of the cells in the data area and follow these steps:
Excel groups and subtotals the data, as directed. (This process may take a while depending on the size of your groups.) You can hide the detail and only show the subtotals by clicking on the small 2 (with the box around it) in the outline area at the left of the worksheet. If you later want to change what is calculated, or if you need to change the number of items in each group, just remove the subtotals (using the button in the Subtotal dialog box) and repeat the above steps.
Another way to derive the statistics from your data is to use a PivotTable. Make sure that there are no subtotals in the data and select a cell within the data. Then follow these steps:
You now how the data desired. If you need to change the number of data items in each group, just go back to the data worksheet and change cell E1 to a different value. You can then return to the PivotTable, display the Options tab of the ribbon, and click the Refresh button.
ExcelTips is your source for cost-effective Microsoft Excel training. This tip (8628) applies to Microsoft Excel 2007, 2010, and 2013. You can find a version of this tip for the older menu interface of Excel here: Calculating Statistical Values on Different-Sized Subsets of Data.
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