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...ple~.,geom=""line"",group=Cell) and then selecting "Run R" works like a dream! I would like to develop an excel based GUI for R-data treatment and plotting, and I would like to use ggplot2 as my plotting engine. What am I doing wrong? Thank you for your help Jannik Vindel?v, Ph.D. Project Manager Dairy Culture Development Innovation P.O. Box 64 Arpajon Cedex F-91292 France Phone: +33 (0)1 6988 3636 Direct Phone: +33 (0)1 6988 3629

...(H) I also have actual data of the same. I would like to estimate the parameters of the theoretical model from real data, but don't know how to go about it in R (I'm fairly new to R). Is there an R-package for this purpose? Any help from the list is highly appreciated. Thank you Jannik Vindel?v, Ph.D. Project Manager Dairy Culture Development Innovation P.O. Box 64 Arpajon Cedex F-91292 France Phone: +33 (0)1 6988 3636 Direct Phone: +33 (0)1 6988 3629