I'd head to Gerard Kleywegt's "Practical Model Validation" web course post-haste:

http://xray.bmc.uu.se/embo2001/modval/

Eric

On Mon, Jan 18, 2010 at 11:00 AM, james09 pruza <[log in to unmask]> wrote:
Dear all,

What are the standard methods for the crystallographic model judgment? What parameters should be included in the final refinement statistics in relation to the model error? What is Cruinkshank DPI and how can it be calculated and what information it gives about the quality of the model?

Thanks in advance for the suggestions.

J.