Results of black sea bass age-reader precision test against randomly selected samples from the 2012 NEFSC spring survey. 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: 2012 Spring Survey (201202) Structure: Scales
Age Reader: JD Date Completed: February 2013
Number Aged: 270 Number Tested: 96
CV: 2.75% Agreement: 85.4%
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 10 Total
Total 13 24 23 18 11 4 2 1 96
0
1 13 13
2 24 1 25
3 22 3 2 27
4 15 3 18
5 5 2 7
6 1 1 2
7 1 2 3
8
9
10 1 1


C. Results Summary

Production Age N N Agreed Percent Agreed Average Test Age
1 13 13 100 % 1.00
2 24 24 100 % 2.00
3 23 22 96 % 2.96
4 18 15 83 % 3.83
5 11 5 45 % 4.45
6 4 1 25 % 5.75
7 2 2 100 % 7.00
8
9 1 0 0 % 10.00


Link disclaimer | Email webmaster | Privacy policy |     File Modified Nov 13, 2013