Results of yellowtail flounder age-reader precision test against randomly selected samples from the fourth quarter of the 2008 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 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: Yellowtail Flounder Test Type: Precision
Sample Source: 2008 Commercial Samples (Q4)   
Age Reader: SM* Date Completed: May 2009
Number Aged: 1056 Number Tested: 105
CV: 4.48% Agreement: 81.9%
Bowker's Test: Not significant
  *SP married to become SM early in 2009.


A. Agreement plot

Yellowtail Flounder Agreement Plot

B. Age-Frequency Table

Test Production Age
Age 0 1 2 3 4 5 6 Total
Total 20 68 13 3 1 105
0
1
2 12 2 14
3 8 62 3 73
4 3 9 1 13
5 1 1 2 4
6 1 1


C. Results Summary

Production Age N N Agreed Percent Agreed Average Test Age
2 20 12 60 % 2.40
3 68 62 91 % 3.04
4 13 9 69 % 3.85
5 3 2 67 % 4.67
6 1 1 100 % 6.00


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(File Modified Nov. 08 2013)