Assuming a perfectly-distributed hash function, there are a few main statistical characteristics to be aware of:

- given a particular hash code length, the chance that two items with
different content will have the
**same hash code**; - given a particular table size, the
**chance of a collision**; - given a particular table size and number of items, the
**distribution**of number of items per slot in the table.

In reality, all of these statistics are related.