If we apply exactly the same set of filters to both the EBD and the Sampling Event Data we can assume that any checklist with no observations for a given species in the EBD should get a zero-count record added to the dataset. This file contains the full population of checklists in the eBird database. Zero-filling relies on the Sampling Event Data, which is a tab-seperated text file containing checklist-level information. We refer to this process as zero-filling the eBird data. However, if we limit ourselves to complete checklists, we can fill in the implied zero counts for any checklists on which a given species isn’t explicitly reported to generate presence-absence data. The EBD, and eBird checklists in general, only explicitly record positive observations of species. Up to this point we’ve been working with presence-only data.
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