Anon, SVD (singular value decomposition) is a statistical technique that was added to Winsteps at the request of a user for a specific project. I have made it available to everyone. It is one way to look for secondary dimensions in the data. Sorry, all I know about it is in the Winsteps Help file at www.winsteps.com/winman/svdfile.htm
If you are not familiar with SVD, then please ignore this output.