Residual Diagnostics for the IOTC yellowfin tuna Stock Synthesis model grid

The data under assessment were the (i) residuals of observed and expected CPUE indices by area (I1-I4) and quarter (Q1-Q4), (ii) residual the observed and predicted mean length of the size composition by fleet (F1-F25) and quarter (Q1-Q4) and (iii) annual recruitment residuals. [...] The runs tests were implemented using the function runs.test in the R package tseries (Trapletti, 2011), considering the 2-sided p-value of the Wald-Wolfowitz runs test. [...] The RMSE values for the CPUE residuals ranged from about 28-36% for the 2018 reference case (Figure 3) and from about 22%-26% for the 2019 reference case (Figure 4), where ranges reflect the variations in RMSE values among the four quarters. [...] IOTC-2019-WPTT21-INF05 Runs tests conducted on meal length residuals only passed for 11 of 25 (44%) fleets in the case of the 2018 reference case (Figure 5) and for 10 of 25 fleets in (40%) in the case of the 2019 reference case (Figure 6). [...] Across the 2018 grid, the reference case is only one of four model that passed the runs tests (Table 1), indicating that the runs test may be sensitive to small variations in the recruitment deviations, particularly at the start and towards the terminal year.