Results of Atlantic herring inter-reader precision test using randomly selected samples from the 2007 NEFSC spring 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 Spring Survey (200703) Age Reader: SE* vs. BJ
Date Completed: September 2007 Sample Size: 1039
Number Aged: 1039 Number Tested: 1039
CV: 1.45% Agreement: 88.7%
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 10 11 Total
Total 2 234 132 101 214 209 63 50 29 4 1 1039
0
1 2 2
2 232 1 233
3 2 129 2 133
4 2 89 11 102
5 10 180 17 207
6 23 176 9 208
7 16 52 7 1 76
8 2 36 6 1 45
9   7 22 29
10   3 3
11 1 1


C. Results Summary

Age (BJ) N N Agreed Percent Agreed Average Age (SE)
1 2 2 100 % 1.00
2 234 232 99 % 2.01
3 132 129 98 % 3.01
4 101 89 88 % 4.08
5 214 180 84 % 5.06
6 209 176 84 % 6.00
7 63 52 83 % 6.89
8 50 36 72 % 8.00
9 29 22 76 % 8.72
10 4 3 75 % 9.50
11 1 1 100 % 11.00


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(File Modified Nov. 08 2013)