To make analysis of time data, especially when the time series data expands many many year, grouping the years into decades will make the analysis a little easier.

**Grouping using calculated formula**

One way to achieve this grouping would be to use a calculated formula like this:

The formula above, uses the DATEPART() function takes the year then subtracts, the year which has had a modulo applied to it. A modulo function simply return the remainder after a division process. For example, the year 1967, lets apply a modulo operator on it. So, I want to take the 1967%10. As a result this will give us an answer of 7. And when you subtract this from the year it will result in 1960. Finally, the “s” is being added as the resulting calculation will be a string.

**Grouping using Groups**

Another way of achieving the same result would be to use the ‘Group’ method. To achieve this, click on the desired date field, then choose “create”, then “Group”, like so:

Then in the dialog box as seen below, you can group the desired year into its respective decades.

You have the option to do it 2-ways now. And I’m sure there are other way you can find to do the same task. For now, this will hopefully help.