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When you click on the button, a dialog box appears. To activate the parameter logistic regression dialog box, start XLSTAT, then select the Dose / Four parameters logistic regression. Setting up a four-parameter logistic regression The example treated here is an medical case where a molecule is being injected at a given concentration, and where the concentration of type of cells in the blood is being measured. Dataset for running a four-parameter logistic regression If several sub-samples were defined (see sub-samples option in the dialog), the model is first adjusted to the standard sample, then each sub-sample is compared to the standard sample. If no group or a single sample was selected, the results are shown for the model and for this sample. Of course, this tool can also be used to fit a four or five-parameter logistic curve to a unique sample. The four or five-parameter parallel lines logistic regression allows comparing the regression lines of two samples (typically a standard sample, and a sample that is currently being studied). This tutorial will show you how to set up and interpret a 4 or 5-parameter logistic regression in Excel using the XLSTAT statistical software.
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