Results of butterfish precision test using randomly selected samples from the 2013 NEFSC autumn survey. (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: Butterfish Test Type: Precision
Sample Source: 2013 Autumn Survey (201304)   
Age Reader: JD Date Completed: February 2015
Number Aged: 836 Number Tested: 86
CV: 5.07% Agreement: 90.7%
Bowker's Test: Not applicable


A. Agreement Plot

Butterfish Agreement Plot

B. Age-Frequency Table

Test Production Age
Age 0 1 2 3 4 Total
Total 33 27 19 6 1 86
0 32 1 33
1 1 26 27
2 17 2 19
3 2 3 1 6
4 1 1



C. Results Summary

Production Age N N Agreed Percent Agreed Average Test Age
0 33 32 97 % 0.03
1 27 26 96 % 0.96
2 19 17 89 % 2.11
3 6 3 50 % 2.83
4 1 0 0 % 3.00


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