Dear Allstat Forgive me if this appears to be a cross-posting. I am putting together a report on best practice in stats methods for in-house validation with respect to biological measurements. I would be most grateful if anyone knows of any good reviews/papers etc that deal with this subject. Of course all replies will be summarised and sent to the mailbase. Thankyou for your help Mike Griffiths Michael Griffiths, Ph.D. Chemometrician Training, Quality and Statistics Group LGC Limited Queens Road Teddington Middlesex, TW11 0LY, UK Tel: +44 (0)20 8943 7325 Fax: +44 (0)20 8943 2767 e-mail: [log in to unmask] ******************************************************************* This email and any attachments are confidential. Any use, copying or disclosure other than by the intended recipient is unauthorised. If you have received this message in error, please notify the sender immediately via +44(0)20 8943 7000 or notify [log in to unmask] and delete this message and any copies from your computer and network. LGC Limited. Registered in England 2991879. Registered office: Queens Road, Teddington, Middlesex, TW11 0LY, UK