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UnhideWhenUsed="false" QFormat="true" Name="Normal" /> For the 5-PL, the EC50/IC50 would be a function of the followin:ĭefSemiHidden="true" DefQFormat="false" DefPriority="99"
Four parameter logistic regression with polymath software free#
I would like to welcome you to try out our free 14-day trial.Īnother great thing about the 4-PL (if you are doing dose response curves) is that the C parameter represents your EC50 or IC50 value depending on the type of assay you are doing. We do offer an elisa analysis software, MasterPlex ReaderFit, which includes both the 4-PL and 5-PL model equations as well as a couple of others in addition to weighting algorithms. Here is a blog post for detail on the 5-parameter logistic model equation.
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A better option would be the 5-parameter logistic which takes aymmetry into account (hence the 5th parameter) which is a better fit for bioassays. The 4-parameter logistic assumes symmetry around the inflection point.