It seems like you're describing the range in statistics, and your definition is partially correct! The range, $R$, is indeed the difference between the largest and smallest data values. In other words:

$R = \text{Maximum value} - \text{Minimum value}$

So, if you have a set of data, the range helps you understand how spread out the data is.

Would you like more details on how to calculate the range, or perhaps an example?

Here are some related questions you might find helpful:

1. How do you calculate the range for a dataset?
2. What is the significance of the range in statistical analysis?
3. How do outliers affect the range of a dataset?
4. What other measures of spread exist besides the range?
5. How does the range relate to the variance and standard deviation?

Tip: When calculating the range, it's important to consider the full dataset and not just the extremes—make sure you don't overlook any values!