Results of the 2008 haddock DFO/NEFSC ageing exchange
using randomly selected samples from the 2007 DFO spring survey.
(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: |
2008 DFO/NEFSC Ageing Exchange
| | Sample Source: |
2007 DFO Spring Survey (TEM2007685)
| Stock Area: |
Georges Bank
| | Age Reader*: |
SJS vs. LVE
| Date Completed: |
Spring 2008
| | Sample Size: |
55
| CV: |
0.46%
| | Agreement: |
96.4%
| Bowker's test: |
Not applicable
| | *The NEFSC age reader is listed first; this does not imply that reader's ages are expected to be more reliable.
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A. Age-Bias Plot
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B. Age-Frequency Table
| Age | Age (SJS) | | | (LVE) | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | Total | | Total | | 10 | 6 | | 17 | | 1 | 12 | 2 | 3 | 1 | 1 | | | 2 | 55 | | 0 | |
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C. Results Summary
| Age (LVE) |
N |
N Agreed |
Percent Agreed |
Average Age (SJS) | | 1 | 10 | 10 | 100 % | 1.00 | | 2 | 6 | 6 | 100 % | 2.00 | | 3 | | | | | | 4 | 17 | 17 | 100 % | 4.00 | | 5 | | | | | | 6 | 1 | 1 | 100 % | 6.00 | | 7 | 11 | 11 | 100 % | 7.00 | | 8 | 2 | 2 | 100 % | 8.00 | | 9 | 5 | 3 | 60 % | 8.80 | | 10 | | | | | | 11 | 1 | 1 | 100 % | 11.00 | | 12 | | | | | | 13 | | | | | | 14 | 2 | 2 | 100 % | 14.00 |
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