I've been stuck for about 20 minutes while working on a reporting application because I can't think of what to call this property. When requesting a report, the user must specify a start date, an end date as well as the "specificity" of the data points, for example "day", "week" etcetera. I have considered calling it "specificity" or "unit size", but I feel that none of those words properly convey the meaning of the property. What word (or words) would best describe the property?
Precision has two meanings related to data collection:
2 the ability of a measurement to be reproduced consistently
3 (mathematics) the number of significant digits to which a value may be measured reliably
While your usage is not a precise fit for either meaning, it should be intuitive enough for the application's users.
I'd suggest periodicity
1. The quality or state of being periodic; recurrence at regular intervals.
Another option is to use frequency of data.