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Trying to set up Opiates testing by GC-MS. Trouble obtaining acceptable calibration line (range 200 - 16000 ng/mL). Using linear regression w/equal weighting.  Any suggestions?  If I try quadratic regression, what type of weighting should I use?  Thank yo

Question asked by jagustin on Aug 9, 2019
Latest reply on Aug 19, 2019 by ron_tackett

Linear regression with equal weighting does not produce an acceptable calibration line.  Trying to obtain a calibration range of 200 ng/mL - 16000 ng/mL.  Would quadratic regression be better?  If so, what type of weighting should I use?   Thank you in advance.