Results of Atlantic herring inter-reader precision test using randomly selected samples from the 2007 NEFSC autumn 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 Autumn Survey (200709)   
Age Reader: SE* vs. BJ Date Completed: January 2009
Number Aged: 938 Number Tested: 255
CV: 1.93% Agreement: 86.7%
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 Total
Total 3 29 32 30 89 56 7 7 2 255
0
1 3 3
2 26   26
3 3 29   32
4 3 27 2 32
5 3 77 5 85
6 10 50 1 61
7 1 4 2 7
8 2 4 1 7
9 1 1 2


C. Results Summary

Age (BJ) N N Agreed Percent Agreed Average Age (SE)
1 3 3 100 % 1.00
2 29 26 90 % 2.10
3 32 29 91 % 3.09
4 30 27 90 % 4.10
5 89 77 87 % 5.09
6 56 50 89 % 5.93
7 7 4 57 % 7.14
8 7 4 57 % 7.86
9 2 1 50 % 8.50


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(File Modified Nov. 08 2013)