Results of Atlantic herring inter-reader precision test using randomly selected samples from the 2007 NEFSC winter survey. (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 readers. Numbers above this diagonal indicate fish which were given higher ages by BJ; those below the shaded boxes were given higher ages by SE. Total age frequencies are given by age for both readers. (C) Results summary, indicating SE's results relative to each of BJ's ages.

Species: Atlantic Herring Test Type: Inter-reader Precision
Sample Source: 2007 Winter Survey (200702)   
Age Reader: SE* vs. BJ Date Completed: July 2007
Number Aged: 448 Number Tested: 451
CV: 1.92% Agreement: 85.4%
Bowker's Test: Not significant
  *SE = trainee


A. Agreement Plot

Herring Agreement Plot

B. Age-Frequency Table

Age Age (BJ)
(SE) 0 1 2 3 4 5 6 7 8 9 10 Total
Total 16 56 74 114 110 36 30 13 2 451
0
1
2 16 16
3 54 2 56
4 2 67 3 1 73
5 5 104 16   125
6   6 87 6 2 101
7 1 6 26 6 1 40
8   4 20 1 25
9   2 10 1 13
10 1 1 2


C. Results Summary

Age (BJ) N N Agreed Percent Agreed Average Age (SE)
2 16 16 100 % 2.00
3 56 54 96 % 3.04
4 74 67 91 % 4.04
5 114 104 91 % 5.04
6 110 87 79 % 5.89
7 36 26 72 % 6.94
8 30 20 67 % 7.73
9 13 10 77 % 8.85
10 2 1 50 % 9.50


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