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Hi, I am trying to derive a correction for the usual expression of uncertainty (s) in a predicted x value (in a chemistry context, y is the dependent (instrument response) and x the independent (concentration) variable). The usual expression of standard error for x is derived only with errors in y accounted for. Does anyone know where I can get a detailed explantion of how the usual expression for s(x) is derived? Thanks in advance 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 7352 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