Results of butterfish age-reader precision test against randomly selected samples from the first through fourth quarters of the 2016 NEFSC commercial samples. (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 production ages across the top and the test 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: Butterfish Test Type: Precision
Sample Source: 2016 Commercial Samples (Q1-4)    
Age Reader: JD Date Completed: January 2018
Number Aged: 271 Number Tested: 57
CV: 6.29% Agreement: 82.5%
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 Total
Total 1 15 19 20 2 57
0 1         1
1   12 1 13
2   3 15 3 21
3   3 17 20
4   2 2


C. Results Summary

Production Age N N Agreed Percent Agreed Average Test Age
0 1 1 100% 0.00
1 15 12 80% 1.20
2 19 15 79% 2.11
3 20 17 85% 2.85
4 2 2 100% 4.00


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(File Modified Jan. 30 2018)