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
|
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 |
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| |
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| | 8 |
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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 |
|
