Results of American plaice inter-reader precision test against randomly selected samples from the 2009 NEFSC autumn survey. (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 JD. Total age frequencies are given by age for both readers. (C) Results summary, indicating JD's results relative to each of JB's ages.

Species: American Plaice Test Type: Inter-reader Precision
Sample Source: 2009 Autumn Survey (200904)    
Age Reader: JD* vs. JB Date Completed: October 2010
Number Aged: 650 Number Tested: 179
CV: 0.67% Agreement: 96.1%
Bowker's Test: Not applicable
  *JD = trainee


A. Agreement Plot

American Plaice Agreement Plot

B. Age-Frequency Table

Age (JD) Age (JB)
0 1 2 3 4 5 6 7 8 9 10 Total
Total 24 39 42 43 21 5 3 1 1 179
0
1
2 24 2 26
3 37 37
4 41 1 42
5 1 42 43
6 21 2 23
7 3 1 4
8 2 2
9 1 1
10 1 1


C. Results Summary

Age (JB) N N Agreed Percent Agreed Average Age (JD)
2 24 24 100 % 2.00
3 39 37 95 % 2.95
4 42 41 98 % 4.02
5 43 42 98 % 4.98
6 21 21 100 % 6.00
7 5 3 60 % 6.60
8 3 2 67 % 7.67
9 1 1 100 % 9.00
10 1 1 100 % 10.00


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(File Modified Nov. 08 2013)