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FIGURE 4. Graph of weighted residual for each model. For better visual display, points are spread out by adding small amount of gaussian noise in x direction. For 1- and 2-exponential models, residuals tend to fall only on one side of zero at each time point. Means of residuals are relatively far from zero, and distributions of residuals are, in general, rather asymmetric and heavily skewed. For kinetic model, similar problems exist. Residuals for Hill model look more reasonable: They are evenly scattered around zero, and their distributions are fairly symmetric. Although, at first 2 time points, residuals are skewed to one side of zero, they are all quite small relative to those of other models.
