Results of butterfish calibration test using randomly selected samples from the 1984 NEFSC spring survey, the 1984 NEFSC autumn survey, and all quarters of the 1984 NEFSC commercial samples. Production ages were completed in 1984. (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: Calibration
Sample Source: 1984 Spring Survey (198402), 1984 Autumn Survey (198405), and 1984 Commercial Samples (all quarters) Number Tested: 769
Age Reader: LD-W Date Completed: January 2009
CV: 2.74% Agreement: 93.4%
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 194 268 239 67 1 769
0 192 1 193
1 2 255 8 265
2 12 217 8 237
3 14 54 1 69
4 5 5


C. Results Summary

Production Age N N Agreed Percent Agreed Average Test Age
0 194 192 99 % 0.01
1 268 255 95 % 1.04
2 239 217 91 % 2.03
3 67 54 81 % 2.96
4 1 0 0 % 3.00


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(File Modified Nov. 08 2013)