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...and have a prototype of this. However, I thought I would ask, is there a reason this hasn't been done? Or is it just a historical carry-over (pun intended I suppose). Warm wishes, Nigel ******************** Research Fellow Massachusetts General Hospital / Broad Institute Book link: http://thenigerianprofessionalaccountant.files.wordpress.com/2013/04/handboo k-of-computational-econometrics-belsley.pdf