Li et al.: A comparison of 4 age-structured stock assessment models 161 
Table 6 
Median absolute relative error (%) in maximum sustainable yield (MSY), fishing mortality rate that corresponds to MSY 
(Fysy), Spawning stock biomass at MSY (SSBysy), SSB, recruitment (R), fishing mortality rate (F), relative SSB, and relative 
F for each case used to compare the 4 age-structured stock assessment models evaluated in this study: the Assessment Model 
for Alaska (AMAK), the Age Structured Assessment Program (ASAP), the Beaufort Assessment Model (BAM), and Stock 
Synthesis (SS). 
Case AMAK ASAP BAM SS AMAK ASAP BAM SS AMAK ASAP BAM SS 
Case 0 3.25 4.10 4.07 3.84 1.04 1.04 1.04 1.04 3.13 3.91 3.95 3.92 
Case 1 5.47 5.83 5.80 5.77 1.04 1.04 1.04 1.04 5.69 5.68 5.62 5.67 
Case 2 7.90 9.02 8.97 9.08 1.04 1.04 1.04 1.04 8.17 8.48 8.42 8.78 
Case 3 3.06 2.76 2.74 2.81 1.04 1.04 1.04 1.04 3.03 2.67 2.76 
Case 4 3.20 1.04 1.04 1.04 1.04 3.33 3.28 3.16 
Case 5 4.09 1.04 1.04 1.04 1.04 4.63 4.28 4.37 
Case 6 : : : 3.44 1.04 1.04 1.04 1.04 3.32 3.66 3.63 
Case 7 : : : 3.28 1.04 1.04 1.04 1.04 4.08 3.32 3.26 
Case 8 : : : 3.62 1.22 1.22 1.22 1.22 3.96 3.78 3.79 
Case 9 : ‘ : 3.24 4 1.04 1.04 1.04 3.14 3.00 2.88 
Case 10 i 0.98 0.98 0.98 7.99 9.52 9.50 
Case 11 : 0.98 0.98 0.98 6.83 8.55 8.56 
Case 12 1.04 1.04 3.13 2.92 
Case BAM 
Case 0 3.80 
Case 1 : : ; 3.93 
Case 2 d 2.07 2.07 i ; 4.17 
Case 3 d 2.09 2.09 : : 3.74 
Case 4 : 1.77 1.76 : : : 3.82 
Case 5 : 3.92 3.94 4.77 
Case 6 : 2.13 2.13 3.92 
Case 7 5 1.98 1.79 : ; 3.85 3.64 
Case 8 4.93 5.95 : 4.20 4.25 
Case 9 1.53 1.54 : 3.20 3.21 
Case 10 2.04 2.04 i 4.26 4.23 
Case 11 2.02 2.02 A 4.13 4.13 
Case 12 2.05 2.05 3.79 3.79 
Relative SSB Relative F 
Case ASAP BAM AMAK ASAP BAM 
Case 0 4.29 4.31 2.06 2.10 2.03 
Case 1 6.39 6.39 2.06 2.04 2.01 
Case 2 9.83 9.75 2.16 2.22 2.12 
Case 3 3.28 3.25 2.08 2.17 2.14 
Case 4 3.80 3.80 1.85 1.90 1.86 
Case 5 3.24 3.20 3.98 4.00 3.92 
Case 6 4.44 4.45 2.21 2.38 2.26 
Case 7 4.50 4.14 1.96 2.26 2.00 
Case 8 5.50 5.97 3.29 4.40 4.96 
Case 9 3.46 3.45 1.76 1.74 1.68 
Case 10 9.73 9.71 2.06 2.06 2.06 
Case 11 9.43 9.41 2.08 2.06 2.07 
Case 12 3.51 3.52 2.13 2.08 2.08 
