What is a data identifier?
A "data identifier" is a permanant identifier that you can use to link to your dataset. There are several types of identifiers that are used by various data repositories and on the web.
The University of California Curation Center (UC3) at the California Digital Library offers EZID, which is a simple service for assigning a unique identifier to digital objects. If you use Merritt to store your data, unique IDs are automatically created.
Contact UC3 for more information on EZID.
It is important to cite any datasets you use, as well as the published literature that you refer to.