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Many log(dose) response curves follow the familiar symmetrical sigmoidal shape. The usual goal is to determine the EC50 of the agonist - the concentration that ...

https://www.graphpad.com/guides/prism/latest/curve-fitting/

With nonlinear regression of a normalized dose-response curve, the goal is to adjust the values of the EC50 (the concentration that provokes a response ...

https://www.graphpad.com/guides/prism/latest/curve-fitting/

The results make no sense if the top plateau of a sigmoid curve is far larger than the highest data point, or an EC50 is not within the range of your X values.

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Note that the model does not assume that the two EC50 values are the same, but it does assume the two Hill Slopes are the same. Here is a user-defined model ...

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The EC50; Confidence intervals of the EC50; Hill slope; Choosing a dose-response equation; Pros and cons of normalizing the data; The term "logistic"; 50% of ...

https://www.graphpad.com/guides/prism/latest/curve-fitting/

You need to decide when those likelihood are far enough apart that you will believe the parameters are different. Keywords: EC50 IC50 ED50 logIC50 logED50 log ...

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We use the term EC50 to be consistent with the equations for the other sigmoid curves. The term IC50 is used more frequently ("E" stands for effective; "I ...

https://www.graphpad.com/guides/prism/latest/curve-fitting/

EC50. Explore the Knowledgebase. Analyze, graph and present your scientific work easily with GraphPad Prism. No coding required. Try for Free. Scientific ...

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... (EC50/IC50). Compare Across Single or Multiple Groups. Prism's Grouped and Column Graphs simplify flow cytometry analysis, guiding you to identify trends and ...

https://www.graphpad.com/features/

LogEC50 is the logarithm of the EC50 (effective concentration, 50%). With different kinds of variables, this variable is sometimes called ED50 (effective ...

https://www.graphpad.com/guides/prism/7/curve-fitting/