Finding extremely clean, tested, and accurate "Reference" quality datasets intended for verification and calibration purposes can be painfully difficult. Making

Finding extremely clean, tested, and accurate "Reference" quality datasets intended for verification and calibration purposes can be painfully difficult. Making a claim that your data is "correct" and usable for validation is a fairly bold move, and few are willing to go that far. I believe that NIST is your best bet for finding reliable "Reference" datasets. In the distant past (i.e. around 2000), NIST made various "Special Databases" available. Some of them may be useful for the kinds of things you mentioned. The information on this FTP server is ancient and crufty, but might help in some way. ftp://sequoyah.ncsl.nist.gov/pub/databases/catalog.txt Also check the "README" files in the various directories. Though they are not the complete databases, there's some sample data available: ftp://sequoyah.ncsl.nist.gov/pub/databases/data/ I simply don't know if NIST still has reference datasets like the old "Special Databases" that they used to provide, so I think your best bet is to contact them and ask.