Results of cod age-reader accuracy test against randomly selected samples from the NEFSC reference collection, conducted after production aging. (A) Age-bias plot, showing the average age attained during the test for fish of each age from the reference collection. Error bars indicate 95% confidence intervals. (B) Age-frequency table, showing the test ages across the top and the reference ages on the left. Numbers in the shaded boxes indicate agreement between the two ages. Numbers above this diagonal indicate fish which were over-aged during the test; those below the shaded boxes were under-aged. Total age frequencies are given by age for both the test and reference ages. (C) Results summary, indicating results of the test for each reference age.

Species: Cod Test Type: Accuracy
Sample Source: Reference Collection Stock Area: Georges Bank
Age Reader: NS Date Completed: May 2006
Sample Size: 45 CV: 3.85%
Agreement: 86.7%


A. Age-Bias Plot

Cod Age-Bias Plot

B. Age-Frequency Table

Ref Test Age
Age 0 1 2 3 4 5 6 7 Total
Total 11 15 9 4 5 1 45
0
1
2 11 4 1 16
3 11 11
4 8 8
5 4 1 5
6 4 4
7 1 1


C. Results Summary

Ref Age N N Agreed Percent Agreed Average Test Age
2 16 11 69 % 2.38
3 11 11 100 % 3.00
4 8 8 100 % 4.00
5 5 4 80 % 5.20
6 4 4 100 % 6.00
7 1 1 100 % 7.00


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