Hi 1Rnwb, I am a technical support for Hitachi Solutions and I saw your post regarding ELISA analysis. When I opened up your .csv file, I noticed it was a Luminex file from the Data Collector 1.7 software. My company developed a multiplex data analysis software for the Luminex platform called http://www.miraibio.com/masterplex-qt/qt-luminex-quantitative-data-analysis-software.html MasterPlex QT . I used this software and did ran the curve-fitting for you and included both the report (.csv file) with the final results and the MasterPlex QT project file (.mlxq). Here is one of your standard curves for "ENA-78(37)": http://r.789695.n4.nabble.com/file/n3325361/StandardChart.png http://r.789695.n4.nabble.com/file/n3325361/ds2_cs_panela_p2_101806.csv ds2_cs_panela_p2_101806.csv http://r.789695.n4.nabble.com/file/n3325361/ds2_cs_panela_p2_101806.mlxq ds2_cs_panela_p2_101806.mlxq I also noticed that quite a few of your samples had pretty low bead counts (<35) where the data is not significant so they are outlined in the project file. I would normally flag these as outliers but I just left all the data intact. You'll be able to find this information and much more in my blog post titled http://www.miraibio.com/blog/2009/02/tips-for-luminex-data-analysis/ 10 Tips for Luminex/Bio-Plex Data Analysis . I hope this information helps. Feel free to contact me directly at aliu at miraibio dot com if you have any questions regarding the Luminex data analysis. Allen Liu -- View this message in context: http://r.789695.n4.nabble.com/creating-standard-curves-for-ELISA-analysis-tp875877p3325361.html Sent from the R help mailing list archive at Nabble.com.