Results of the 2011 haddock ageing exchange using randomly selected samples from the second through fourth quarters of the 2010 DFO commercial samples. (A) Agreement plot, showing the ages attained by the Canadian age reader versus the ages attained by the U.S. age reader. A small amount of noise was added to the data to improve visibility of overlapping data points. (B) Age-frequency table, showing each reader's ages. Numbers in the shaded boxes indicate agreement between the two ages. Numbers above this diagonal indicate fish which were given higher ages by the U.S. age reader; those below the shaded boxes were given higher ages by the Canadian age reader. Total age frequencies are given by age for both readers. (C) Results summary, indicating results for the Canadian reader relative to each age for the U.S. reader.

Species: Haddock Test Type: 2011 U.S./Canada Ageing Exchange
Sample Source: 2010 DFO Commercial Samples (Q2-4) Stock Area: Georges Bank
Age Reader*:DK vs. SJS Date Completed: Spring 2011
Number Tested: 51    
CV: 3.22% Agreement: 86.3%
Bowker's test: Not significant
    *The Canadian age reader is listed first; this is not meant to imply that either reader's ages are expected to be more reliable.

A. Agreement Plot

Haddock Agreement Plot

B. Age-Frequency Table

Age Age (SJS)
(DK) 0 1 2 3 4 5 6 7 8 9 10 11 12 13 Total
Total 4 5 3 2 2 1 28 4 1 1 51
0
1 2 2
2 2 5 1 8
3 2 1 3
4 1 1
5 2 2
6 1 1
7 27 27
8 1 1
9
10 4 4
11
12 1 1 2
13


C. Results Summary

Age (SJS) N N Agreed Percent Agreed Average Age (DK)
1 4 2 50 % 1.50
2 5 5 100 % 2.00
3 3 2 67 % 2.67
4 2 1 50 % 3.50
5 2 2 100 % 5.00
6 1 1 100 % 6.00
7 28 27 96 % 7.04
8
9
10 4 4 100 % 10.00
11 1 0 0 % 12.00
12
13 1 0 0 % 12.00


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