Results of pollock age-reader precision test against randomly selected samples from all quarters of the 2013 NEFSC commercial samples. (A) Agreement plot, showing both of the reader's ages. A small amount of noise was added to the data to improve visibility of overlapping data points. (B) Age-frequency table, showing the first set of ages across the top and the second set of 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 the second time; those below the shaded boxes were under-aged. Total age frequencies are given by age for both ages. (C) Results summary, indicating results of the test in relation to the first set of ages.

Species: Pollock Test Type: Precision
Sample Source: 2013 Commercial Samples (Q1-4)   
Age Reader: JP* Date Completed: August 2014
Number Aged: n/a Number Tested: 93
CV: 1.69% Agreement: 81.9%
Bowker's Test: Not significant
  *JP = trainee; each fish was aged twice as part of training.


A. Agreement Plot

Pollock Agreement Plot

B. Age-Frequency Table

  Age 1
Age 2 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Total
Total 2 6 11 23 20 14 4 7 4 1 1 1 94
0
1
2
3 2 2
4 6 6
5 11 4 15
6 19 3 22
7 17 1 18
8 11 1 12
9 2 3 5
10 6 6
11 1 2 3
12 1 1 2
13 1 1 2
14
15 1 1


C. Results Summary

Age 1 N N Agreed Percent Agreed Average Age 2
3 2 2 100 % 3.00
4 6 6 100 % 4.00
5 11 11 100 % 5.00
6 23 19 83 % 5.83
7 20 17 85 % 6.85
8 14 11 79 % 8.07
9 4 3 75 % 8.75
10 7 6 86 % 10.14
11 4 2 50 % 11.75
12 1 0 0 % 13.00
13 1 0 0 % 12.00
14 1 0 0 % 15.00


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(File Modified Jul. 08 2015)