Results of winter flounder age-reader precision test against randomly selected samples from the 2004 NEFSC autumn survey (SNE stock) and the 2005 NEFSC spring survey (GOM stock). Otoliths were used for age determinations. (A) Agreement plot, showing both the production and test ages. A small amount of noise was added to the data to improve visibility of overlapping data points. (B) Age-frequency table, showing the test ages across the top and the production ages on the left. Numbers in the shaded boxes indicate agreement between the two ages. Numbers above this diagonal indicate fish which were under-aged during the test; those below the shaded boxes were over-aged. Total age frequencies are given by age for both the test and production ages. (C) Results summary, indicating results of the test for each production age.

Species: Winter Flounder Test Type: Precision
Sample Source: 2004 Autumn Survey (200407) & 2005 Spring Survey (200503)
Stock Area:Southern New England (200407) & Gulf of Maine (200503)
Age Structure: Otoliths
Age Reader:JB Date Completed:August 2005
Number Aged: 580 Number Tested: 110
CV: 1.59% Agreement: 93.6%
Bowker's Test: Not applicable   


A. Agreement plot

Winter Flounder Agreement Plot

B. Age-Frequency Table

Test Production Age
Age 0 1 2 3 4 5 6 7 8 9 Total
Total 11 37 29 16 11 2 3 1 110
0
1 11 11
2 34 2 36
3 3 26   29
4 1 16 17
5 10   10
6 1 2 3
7 3 3
8
9 1 1


C. Results Summary

Production Age N N Agreed Percent Agreed Average Test Age
1 11 11 100 % 1.00
2 37 34 92 % 2.08
3 29 26 90 % 2.97
4 16 16 100 % 4.00
5 11 10 91 % 5.09
6 2 2 100 % 6.00
7 3 3 100 % 7.00
8
9 1 1 100 % 9.00


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(File Modified Nov. 13 2013)