GraphPad Curve Fitting Guide

Linear quadratic: Y is percentage dead

Linear quadratic: Y is percentage dead

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Linear quadratic: Y is percentage dead

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Introduction

Mammalian cell death after exposure to radiation after a dose D of radiation often follows the linear-quadratic model.

Step by step

Create an XY table. Enter radiation doses into X and percent dead cells into Y.  After entering data, click Analyze, choose nonlinear regression, choose the panel of linear-quadratic equations, and choose Linear quadratic: Y is percentage dead.

Model

 Y = 100 * [ 1.0 -exp(-1*(A*X + B*X^2))]

Interpret the parameters

X: Dose of radiation

Y: Percentage of cells dead

A: Coefficient for linear killing

B: Coefficient for quadratic killing