Hi I am also trying to back calculate a particular conconcentration using Youden's Index. However, I have been using a different software package as I have a continuous dataset. Could you please explain how you derived the values -4.71 and 0.0231, i.e. what varables have been used in a regression. Is this something I could do manually by graphing respective variable in excel and getting a trend line and regression equation. I too tried to manually generate the value -1.99 and the closest I got was -1.7, is this a natural log or log to some base value? Thanks for any assistance you are able to provide. Regards
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