Results of cod inter-reader precision test against randomly selected samples from the first quarter of the 2010 NEFSC commercial samples (Gulf of Maine stock only). (A) Agreement plot, showing the ages attained by each reader. A small amount of noise was added to the data to improve visibility of overlapping data points. (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 ER; those below the shaded boxes were given higher ages by NS. Total age frequencies are given by age for both readers. (C) Results summary, indicating NS's results relative to each of ER's ages.

Species: Cod Test Type: Inter-reader Precision
Sample Source: 2010 Commercial Samples (Q1) Stock Area: Gulf of Maine
Age Reader: NS vs. ER* Date Completed: September 2011
Number Aged: 1243 Number Tested: 101
CV: 4.13% Agreement: 66.3%
Bowker's test: P < 0.001
  *ER aged Q1 Gulf of Maine cod samples to assist the primary age reader (NS) in meeting deadlines.


A. Agreement Plot

Cod Agreement Plot

B. Age-Frequency Table

Age Age (ER)
(NS) 0 1 2 3 4 5 6 7 8 9 10 11 Total
Total 7 16 25 19 16 10 6 1 1 101
0
1
2
3 6   6
4 1 15 3   19
5 1 22 12   35
6    5 4 9
7   2 11 5 1 19
8     1 5 3 1 10
9    2 2
10    
11   1 1


C. Results Summary

Age (ER) N N Agreed Percent Agreed Average Age (NS)
3 7 6 86 % 3.14
4 16 15 94 % 4.06
5 25 22 88 % 4.88
6 19 5 26 % 5.47
7 16 11 69 % 6.81
8 10 5 50 % 7.50
9 6 2 33 % 8.17
10 1 0 % 8.00
11 1 1 100 % 11.00


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(File Modified Dec. 02 2013)