Results of black sea bass age-reader precision test against randomly selected samples from the 1999, 2002 and 2006 winter surveys. Scales 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: Black Sea Bass Test Type: Precision
Sample Source: Various Winter Surveys (199901, 200201 and 200603)
Structure: Scales
Age Reader: JD Date Completed: February 2011
Number Aged: 720 Number Tested: 98
CV: 3.89% Agreement: 81.6%
Bowker's Test: Not significant   


A. Agreement Plot

Black Sea Bass Agreement Plot

B. Age-Frequency Table

Test Production Age
Age 0 1 2 3 4 5 6 7 8 9 Total
Total 13 23 22 27 9 3 1 98
0
1 11 11
2 2 20 1 23
3 3 21 1 25
4 22 22
5 4 5 9
6 4 1 5
7 1 1
8 1 1
9 1 1


C. Results Summary

Production Age N N Agreed Percent Agreed Average Test Age
1 13 11 85 % 1.15
2 23 20 87 % 2.13
3 22 21 95 % 2.95
4 27 22 81 % 4.11
5 9 5 56 % 5.44
6 3 1 33 % 7.00
7
8 1 0 0 % 9.00


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(File Modified Nov. 13 2013)