Results of the 2004 haddock aging exchange using randomly selected samples from the third and fourth quarters of the 2002 DFO commercial samples. (A) Age-bias plot, showing the average age attained by the DFO age reader versus the ages attained by the NEFSC age reader. Error bars indicate 95% confidence intervals. (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 DFO age reader; those below the shaded boxes were given higher ages by the NEFSC age reader. Total age frequencies are given by age for both readers. (C) Results summary, indicating results for the NEFSC reader relative to each age for the DFO reader.

Species: Haddock Test Type: 2004 DFO/NEFSC Exchange
Sample Source: 2002 DFO Commercial Samples (Q3-4) Stock Area: Georges Bank
Date Completed: Winter 2003-2004 Sample Size: 48

Age Readers* CVAgreement Bowker's Test
NM² vs. LVE 2.90%83.3% Not significant
SS² vs. LVE 2.59%87.5% Not significant

  *The NEFSC age reader is listed first; this does not imply that reader's ages are expected to be more reliable.
  ²Both NEFSC age readers aged these fish separately, and disagreed on some samples. Therefore, the results for each reader are presented separately.


A. Age-Bias Plot

Haddock Age-Bias Plot

B. Age-Frequency Table

NM vs. LVE
Age Age (NM)
(LVE) 0 1 2 3 4 5 6 7 8 9 10 11 12 Total
Total 1 12 3 3 4 7 2 1 5 6 3 1 48
0
1 1 1
2 11 1 12
3 1 2 3
4 3 1 4
5 3 3
6 6 1 7
7 1 1
8 1 1 2
9 1 4 5
10 5 1 6
11 2 2
12 1 1 2



SS vs. LVE
Age Age (SS)
(LVE) 0 1 2 3 4 5 6 7 8 9 10 11 12 Total
Total 1 14 1 3 4 7 2 2 4 7 2 1 48
0
1 1 1
2 12 12
3 2 1 3
4 3 1 4
5 3 3
6 6 1 7
7 1 1
8 2 2
9 1 4 5
10 6 6
11 2 2
12 1 1 2


C. Results Summary

NM vs. LVE
Age (LVE) N N Agreed Percent Agreed Average Age (NM)
1 1 1 100 % 1.00
2 12 11 92 % 2.08
3 3 2 67 % 2.67
4 4 3 75 % 4.25
5 3 3 100 % 5.00
6 7 6 86 % 6.14
7 1 1 100 % 7.00
8 2 1 50 % 8.50
9 5 4 80 % 8.40
10 6 5 83 % 10.17
11 2 2 100 % 11.00
12 2 1 50 % 11.00



SS vs. LVE
Age (LVE) N N Agreed Percent Agreed Average Age (SS)
1 1 1 100 % 1.00
2 12 12 100 % 2.00
3 3 1 33 % 2.33
4 4 3 75 % 4.25
5 3 3 100 % 5.00
6 7 6 86 % 6.14
7 1 1 100 % 7.00
8 2 2 100 % 8.00
9 5 4 80 % 8.40
10 6 6 100 % 10.00
11 2 2 100 % 11.00
12 2 1 50 % 11.00


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 (Modified May. 14 2009)