Using the 4 Parameter Logistic Curve in Excel
Cracking the Code: Fitting a 4-Parameter Logistic Curve in Excel Like a Pro Alright, let's talk data, specifically the kind that makes an "S" shape. If you've ever dealt with dose-response curves, immunoassays, or just about any biological system where you're measuring a response to a stimulus, you've probably encountered data that looks like a flattened "S." This, my friend, is where the 4-parameter logistic curve in Excel (or 4PL, for short) comes into play. It's a powerhouse for modeling these types of relationships, helping us understand things like drug potency (EC50/IC50) or the dynamic range of an assay. ...