Results of butterfish inter-reader precision test using randomly selected samples from the 2003 NEFSC spring 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 NM; those below the shaded boxes were given higher ages by LD-W. Total age frequencies are given by age for both readers. (C) Results summary, indicating LD-W's results relative to each of NM's ages.

Species: Butterfish Test Type: Inter-reader Precision
Sample Source: 2003 Spring Survey (200303)   
Age Reader*: LD-W vs. NM Date Completed: April 2009
Number Aged: 218 Number Tested: 156
CV: 5.60% Agreement: 84.0%
Bowker's Test: Not significant
  *This test was between two experienced butterfish age readers.


A. Agreement Plot

Butterfish Agreement Plot

B. Age-Frequency Table

Age Age (NM)
(LD-W) 0 1 2 3 4 5 Total
Total 91 32 24 7 2 156
0
1 89 9 98
2 2 19 6 27
3 4 17 1 22
4 1 5 1 7
5 1 1 2


C. Results Summary

Age (NM) N N Agreed Percent Agreed Average Age (LD-W)
1 91 89 98 % 1.02
2 32 19 59 % 1.84
3 24 17 71 % 2.79
4 7 5 71 % 4.00
5 2 1 50 % 4.50


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(File Modified Nov. 08 2013)