Results of the 2004 cod 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: |
Cod
| Test Type: |
2004 DFO/NEFSC Exchange
| | Sample Source: |
2002 DFO Commercial Samples (Q3-4)
| Stock Area: |
Georges Bank
| | Age Reader*: |
NM/NS vs. BH
| Date Completed: |
Winter 2003-2004
| | Sample Size: |
46
| CV: |
2.60%
| | Agreement: |
78.3%
| Bowker's test: |
Not significant
| | *The NEFSC age readers are listed first; this does not imply their ages are expected to be more reliable. Both NEFSC age readers worked together to age these samples.
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A. Age-Bias Plot
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B. Age-Frequency Table
| Age | Age (NM/NS) | | | (BH) | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | Total | | Total | | | 6 | 2 | 14 | 1 | 9 | 7 | 1 | 5 | | | | 1 | 46 | | 0 | |
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C. Results Summary
| Age (BH) |
N |
N Agreed |
Percent Agreed |
Average Age (NM/NS) | | 2 | 5 | 5 | 100 % | 2.00 | | 3 | 3 | 2 | 67 % | 2.67 | | 4 | 14 | 14 | 100 % | 4.00 | | 5 | | | | | | 6 | 12 | 9 | 75 % | 6.08 | | 7 | 5 | 4 | 80 % | 7.40 | | 8 | 4 | 1 | 25 % | 8.25 | | 9 | 1 | 1 | 100 % | 9.00 | | 10 | 1 | 0 | 0 % | 9.00 | | 11 | | | | | | 12 | 1 | 0 | 0 % | 13.00 |
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