Recommendation:
We recommend the units attribute’s value for a particular variable if given should be the same across all files in a data collection.
Recommendation Details: Knowing the physical units of data in a variable is vital for proper use. While the presence of the units attribute satisfies that requirement, its value may vary from one file to another for the same variable. For example, while these two values of the units attribute represent length: mm and μm, the software processing that variable’s data from different files may not take the attribute’s value change into account. Using the same units attribute value for one variable throughout a data collection decreases the chance of errors.
