I've fianlly got around to contacting Gavin Schmidt of Nasa about those goodness of fit stats from Hansen's 1988 model predictions.
Apologies to JL for the wait and the enforced absence. You may or may not remember the discussion from some time ago that related to this article on RealClimate.
Anyhow, I'm hoping to get a reply from Gavin in the following days. I hope that you are still interested.
I'm going to do my own analysis of it and then I'll post it up somewhere with the data so that anyone can try and replicate it. This might take a little while because my workload just increased again.