Table 2 Summary of GAM results for each frequency band. * indicates values for evaluating best-fit model for a given frequency band; ** indicates values used to compare between different best-fit models

From: Relationship between container ship underwater noise levels and ship design, operational and oceanographic conditions

EQUATION- with covariates in the order of importance

AIC*

Residual deviance*

% of deviance explained**

No. covariates**

BROAD-BAND (20–1,000 Hz)

    

BB ~SPD + LOA + MTH + s(rSSPD,3) + TONE + MWD + s(WVHT,2) + CDIR

2834.5

3826.3

56

8

OCTAVE BAND CENTERED AT 16 Hz

    

OB16 ~ SPD + LOA + MTH + WVHT + s(RAN,3) + rPSPD + MWD + CDIR

3341.9

9003.2

54

8

OCTAVE BAND CENTERED AT 31.5 Hz

    

OB31 ~ SPD + LOA + MTH + WVHT + YB + s(CDIR,2)+ s(tOTH,3) + rPSPD

3294.3

8252.7

53

8

OCTAVE BAND CENTERED AT 63 Hz

    

OB63 ~ s(SPD,2) + rHP + s(RAN,3) + MTH + s(GT,3) + s(OTH,3)

3109.4

6021.7

43

6

OCTAVE BAND CENTERED AT 124 Hz

    

OB125 ~ SPD + MTH + s(GT,3) + s(RAN,2) + rLOA

2992.9

5083.2

38

5

OCTAVE BAND CENTERED AT 250 Hz

    

OB250 ~ SPD + MTH + GT + TONE + s(rSSPD,3) + rLOA + s(RAN,2)

3022.0

5284.7

44

7

OCTAVE BAND CENTERED AT 500 Hz

    

OB500 ~ s(SPD,2) + MTH + TONE + GT

3192.9

7146.0

39

4

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