There are times when we are required to group numbers into intervals of unequal sizes. To do this, we need to understand how to use the LOOKUP function in excel. This article provides a clear guide on how to **group numbers at uneven intervals** in excel.

*Figure 1: How to group numbers at uneven intervals*

**General syntax of the formula**

**=LOOKUP(value, intervals, groups)**

**Explanation of the formula**

The LOOKUP function plays a fundamental role in helping us group at uneven intervals. In the example above, the groups are in column C.

The formula in cells C2 is **=LOOKUP(B2,D5:D8,E5**:E8)

**Understanding how the formula works**

- The function is configured in a way that allows it to lookup values in the ranges supplied. In our example above, the function is configured as follows;
- The lookup values are ages found in column B.
- The lookup vector is the named range “age”, D5:D8
- Result vector is names as “group” which is E5:E8
- The above setup allows the LOOKUP function to perform an appropriate match in the numeric values in the column D. it then returns the values associated to it from column E.

**Things to note**

- LOOKUP function will return a corresponding group is it finds an exact match in the age column,
- In the event that the function does not find an exact match, it will traverse the age column until it finds a larger value.
- The function will return the largest value which is associated with the 50+
- The LOOKUP function returns an #N/A error in the event age is less than the smallest value in the age column.
- For this function to work appropriately, the ages must appear in an ascending order.

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