Results of witch flounder age-reader calibration test using randomly selected samples from the 2005 NEFSC spring survey. (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: Witch Flounder Test Type: Calibration
Sample Source: 2005 Spring Survey (200503) Number Tested:76
Age Reader: JB Date Completed: February 2007
CV: 2.08% Agreement: 80.3%
Bowker's Test: Not significant


A. Agreement plot

Witch Flounder Agreement Plot

B. Age-Frequency Table

Test Production Age
Age 0 1 2 3 4 5 6 7 8 9 10 11 12 13 Total
Total 1 6 2 6 10 11 12 12 8 4 2 1 1 76
0
1 1 1
2 6 6
3 2 2
4 5 1 6
5 1 9 10
6 11 1 12
7   6 3  9
8 4 8 2 14
9 1 1 6 1 9
10   3 3
11 2 2
12 1 1
13 1 1


C. Results Summary

Production Age N N Agreed Percent Agreed Average Test Age
1 1 1 100 % 1.00
2 6 6 100 % 2.00
3 2 2 100 % 3.00
4 6 5 83 % 4.17
5 10 9 90 % 4.90
6 11 11 100 % 6.00
7 12 6 50 % 7.42
8 12 8 67 % 7.83
9 8 6 75 % 8.75
10 4 3 75 % 9.75
11 2 2 100 % 11.00
12 1 1 100 % 12.00
13 1 1 100 % 13.00


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(File Modified Nov. 08 2013)