Table 5.

Effect of control population viability declines on the parameter estimates

ΔMCONT/ ΔMMA*	ΔM,† %	UBM†	SBM†	G33, % decline‡
0.25	0.28	0.030	0.095	1.5
0.50	0.35	0.045	0.077	3.8
0.75	0.46	0.079	0.058	7.6
0.90	0.57	0.120	0.047	11.2
0.95	0.61	0.141	0.044	12.8

^*Per-generation viability decline of control populations, relative to that of the MA lines. 

^†Estimates after correcting for control decline. For example, at MA G27, 17 control generations had elapsed. Assuming ΔM_CONT/ΔM_MA = 0.5, the corrected ΔM estimate is given by 0.24/[1 − (17/27)(0.5)]; 0.24 is the uncorrected estimate from Table 3, and the second term in the brackets corrects for the underestimation of base generation viability caused by the control decline. Performing a similar calculation for the G33 data and averaging the results gives the value shown, 0.35. The corrected U_BM and S_BM estimates are calculated using the corrected ΔM and ΔV from Table 3; the latter depends on data from the MA lines only. 

^‡Percent by which the viability of the control populations would have declined by MA G33, calculated as 22 (number of control generations) times the product of the first two columns.