It was with a great pleasure that I gave a talk on the uncertainties in the prediction of chemical/physical properties using group contribution methods at the combined PSE2015/ESCAPE25 conference. The conference was extremely well organized by Prof. Gani and his team.
The keynote was well received and generated a lot of interest by the people in the room. You can already download the slides. The main takeaway is that at the moment the prediction interval for the group contribution methods (QSPR) is not fully reliable.
A paper going more in depth is in writing at the moment, so you can expect a publication within the next 3 months. The work in progress is bringing solutions to this issue.