A statistics collection point (stats collector) object is a mathematical "counter" whose scope of data collection is determined by its placement in your directory hierarchy. As calls are made and received, the properties of each one are collated for future consumption by display boards.
Stats points can be configured to only collect calls of a certain type or calls whose properties match certain criteria. Additionally, when configuring a stats collection point, a subject must be specified, which determines the property of each call whose value will be used when grouping its collated information into distinct sets. For example, specifying a subject of "user" will group its collated call information into sets of data for each distinct user.
A Stats Collector is basically a "counter" that can be placed on any subject and at any point in your organization. It counts calls that match defined parameters as they pass. This information from these Stats Collectors can then be selected and displayed on your customisable display boards.
Most of the information shown in the Summary and Leader board panels of a display board is supplied by Stats Collectors. It will be very difficult to create useful, informative display boards without first understanding Stats collectors.
It is even possible to exclude users and/or channels from Stats Collectors.