Results of winter flounder inter-reader precision test using randomly selected samples from the 2007 NEFSC autumn survey. Otoliths were used for age determinations. (A) Agreement plot, showing the ages attained by each reader. A small amount of noise was added to the data to improve visibility of overlapping data points. (B) Age-frequency table, showing each reader's ages. Numbers in the shaded boxes indicate agreement between the two readers. Numbers above this diagonal indicate fish which were given higher ages by JB; those below the shaded boxes were given higher ages by GT. Total age frequencies are given by age for both readers. (C) Results summary, indicating GT's results relative to each of JB's ages.

Species: Winter Flounder Test Type: Inter-reader Precision
Sample Source: 2007 Autumn Survey (200709) Structure: Otoliths
Age Reader: GT* vs. JB Date Completed: June 2008
Number Aged: 473 Number Tested: 467
CV: 3.23% Agreement: 89.3%
Bowker's Test: P = 0.021   
  *GT = trainee


A. Agreement plot

Winter Flounder Agreement Plot

B. Age-Frequency Table

Age Age (JB)
(GT) 0 1 2 3 4 5 6 7 8 Total
Total 5 67 105 106 103 58 20 2 1 467
0 4 1 5
1 1 66 3 1 71
2   97 13 1 111
3   5 90 8 103
4   2 93 4 1 1 101
5 1 54 6 61
6     13 1 1 15
7      
8    


C. Results Summary

Age (JB) N N Agreed Percent Agreed Average Age (GT)
0 5 4 80 % 0.20
1 67 66 99 % 0.99
2 105 97 92 % 2.02
3 106 90 85 % 2.88
4 103 93 90 % 3.91
5 58 54 93 % 4.93
6 20 13 65 % 5.60
7 2 0 0 % 5.00
8 1 0 0 % 6.00


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(File Modified Nov. 13 2013)