Results of cod age-reader accuracy test against randomly selected samples from the NEFSC reference collection, conducted after production ageing. (A) Agreement plot, showing both the reference and test ages. A small amount of noise was added to the data to improve visibility of overlapping data points. (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 under-aged during the test; those below the shaded boxes were over-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: June 2004
Number Tested: 99    
CV: 1.94% Agreement: 90.9%


A. Agreement Plot

Cod Agreement Plot

B. Age-Frequency Table

Test Reference Age
Age 0 1 2 3 4 5 6 7 8 9 10 Total
Total 5 12 28 16 10 14 7 2 3 2 99
0
1 5 5
2 10 1 11
3 2 25 1 28
4 2 14   16
5 10 10
6 1 13   14
7 1 7 8
8 2 2
9 3 1 4
10   1 1


C. Results Summary

Reference Age N N Agreed Percent Agreed Average Test Age
1 5 5 100 % 1.00
2 12 10 83 % 2.17
3 28 25 89 % 3.04
4 16 14 88 % 4.06
5 10 10 100 % 5.00
6 14 13 93 % 6.07
7 7 7 100 % 7.00
8 2 2 100 % 8.00
9 3 3 100 % 9.00
10 2 1 50 % 9.50


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(File Modified Nov. 08 2013)