Table 1. Comparing approximate and exact expected trajectories.

Initial Frequency, y	Selection Coefficient, s	Effective Population Size, Ne	Time, T, by Which Fixation is Specified to Occur	D, Measure of Mean Mismatch Between Approximate and Exact Trajectories
0.01	0.01	100	100	0.010
			200	0.016
			400	0.018
			800	0.017
		200	100	0.005
			200	0.013
			400	0.019
			800	0.026
	−0.01	100	100	0.005
			200	0.011
			400	0.013
			800	0.014
		200	100	0.002
			200	0.007
			400	0.013
			800	0.022
0.1	0.01	100	100	0.009
			200	0.016
			400	0.018
			800	0.017
		200	100	0.005
			200	0.011
			400	0.019
			800	0.027
	−0.01	100	100	0.005
			200	0.011
			400	0.014
			800	0.015
		200	100	0.001
			200	0.006
			400	0.014
			800	0.023

We compare the approximation of the expected trajectory, from Equation 9, with the exact numerical result, calculated from the Wright–Fisher model (Fisher 1930; Wright 1931). The quantity D, defined by $D=T^{-1}{\displaystyle {\sum }_{t=0}^T\left|{\overline{X}}_{\text{approx}}\left(t\right)-{\overline{X}}_{\text{WF}}\left(t\right)\right|}$, is a measure of the mean mismatch between the two trajectories.