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Method TA1.8 *

Method TA1.8 *. A 2-stage method of weighting composition data: Calculates multiplier, w , so that N 2 y = w N 1y , where N 1 y = sample size assumed for year y in model, N 2 y = recommended sample size Uses residuals of mean length (or age ).

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Method TA1.8 *

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  1. Method TA1.8* A 2-stage method of weighting composition data: Calculates multiplier, w, so that N2y = wN1y, where N1y = sample size assumed for year y in model, N2y = recommended sample size Uses residuals of mean length (or age). *See Appendix A of Francis (CJFAS 68:1124-1138, 2011)

  2. Chilean Hake example

  3. Chilean hake example Multinomial sample sizes Stage-1 Stage-2 Composition data set TA1.1+TA1.2TA1.3TA1.8 Trawl fishery 150 258 115 116 15 Commercial longline fishery 150 240 154 152 10 Artisanal longline fishery 150 557 251 248 25 Survey 150 338 232 233 69 + McAllister & Ianelli (1997)

  4. REYE Fishery Retained Catch Fleet w trawl 0.22 fix 0.24 trawl + fix 0.22 asf0.067 all 0.15

  5. REYE Fishery Discards Fleet w trawl 0.18 fix 0.18 trawl + fix 0.17

  6. REYE Surveys Survey w tri 0.41 akslope 3.2 combo 0.11 tri + akslope 0.53 tri + combo 0.17 all 0.20

  7. REYE Fishery age-at-length Fleet w trawl 0.76 asf 0.51 trawl + asf 0.61

  8. REYE Survey age-at-length Survey w combo 1.63!!

  9. AUR FisheryLengths Retained

  10. AUR Fishery Lengths Retained Fleet sex w lo hi twl sex 0.31 0.22 0.55 comb 0.75 0.45 1.72 nontr sex 0.56 0.34 1.32 comb 0.36 0.28 0.50 ALL BOTH 0.36 0.28 0.50

  11. AUR FisheryLengths Discards w = 0.97 (0.47,5.39)

  12. AUR Survey Lengths w = 0.52 (0.36,1.11)

  13. AUR TWL Age-at-length w = 0.43 (0.32, 0.74)

  14. AUR Survey Age-at-length w = 1.8 (1.4, 2.5)

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