Prof. Terrance J. Quinn II - PowerPoint Presentation

Slide1

Prof. Terrance J. Quinn IIUniversity of Alaska FairbanksJuneau AK USATerry.Quinn@alaska.edu and Richard B. DerisoInter-American Tropical Tuna CommissionLa Jolla CA USArderiso@iattc.org

Combining the Cohen-Fishman growth increment model with a Box-Cox transformation: flexibility and uncertaintySlide2

Modeling GrowthL = length, a = age,

Y

,

x

= size (any function of

L

)

Naive

:

L

= growth model + (normal) error

Less

naive

:

L

= growth model * (lognormal) error

Standard

:

L



a

through growth transition matrix

Stochastic

:

L

(this time) =

L

(last time) + growth incrementSlide3

PART 1. Cohen-Fishman Model (1)Slide4

PART 1. Cohen-Fishman Model (2)Slide5

PART 1. Cohen-Fishman Model (3)Slide6

PART 1. Cohen-Fishman Model (4)

Example EBS Pacific codSlide7

PART 1. Cohen-Fishman Model (5)

Example EBS Pacific codSlide8

PART 1. Cohen-Fishman Model (6)Slide9

PART 1. Cohen-Fishman Model (7)Slide10

PART 2. Box-Cox Transformation (1)Slide11

PART 2. Box-Cox Transformation (2)Slide12

Combining Cohen-Fishman and Box-Cox Slide13

PART 3. Combining Cohen-Fishman and Box-CoxSlide14

PART 3. Combining Cohen-Fishman and Box-CoxSlide15

PART 3. Combining Cohen-Fishman and Box-CoxSlide16
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Questions or comments?