Results of all QA/QC Exercises
for Cod, Gadus morhua

Gadus morhua


Initials for each age reader are given. All samples were collected by the NEFSC unless otherwise noted. Stock indicates which stock area samples were taken from, Georges Bank (GB) or Gulf of Maine (GOM); if not specified, samples were from both areas combined. Bowker’s test results either show the P-value, ‘n/s’ (not significant at the α = 0.05 level), or are left blank where the test was not applicable.

Sample Source StockTest Type Date Completed Age Reader Sample Size CV (%) Agreement (%) Bowker's test
2008 Commercial Samples (Q4) GB Precision 5/2009 NS 76 0.00 100.0  
2008 Commercial Samples (Q2) GB Precision 4/2009 NS 50 0.13 98.0  
2008 Autumn Survey (200807)   Precision 3/2009 NS 50 2.18 92.0  
2003-2004 Massachusetts Surveys (2391, 2392, 2491, & 2492)   Precision 7/2008 NM 100 4.65 90.0  
2007 Commercial Samples (Q1-2) GB Exchange Spring 2008 NS vs. BH 99 1.80 88.9 n/s
2006 Fall Survey (200610) GB Exchange Spring 2008 NS vs. BH 60 2.83 88.3 n/s
2007 Commercial Samples (Q3-4)   Precision 6/2008 NS 81 0.35 97.5  
2007 Commercial Samples (Q1-2)   Precision 6/2008 NS 100 0.13 99.0  
Cod Reference Collection GB Accuracy 6/2008 NS 75 0.27 98.7  
2008 Spring Survey (200803)   Precision 6/2008 NS 100 0.11 99.0  
2007 Autumn Survey (200709)   Precision 6/2008 NS 50 0.00 100.0  
2004 DFO Commercial & Observer Samples (Q3-4) GB Exchange Spring 2007 NM/NS vs. BH 56 1.40 91.1  
2005 DFO Spring Survey (TEL2005545) GB Exchange Spring 2007 NM/NS vs. BH 50 0.89 94.0  
2005 Commercial Samples (Q1) GB Exchange Spring 2007 NM/NS vs. BH 53 2.28 84.9 n/s
2005 Autumn Survey (200510) GB Exchange Spring 2007 NM/NS vs. BH 56 1.79 91.1  
Cod Reference Collection GB Accuracy 5/2007 NS 100 0.61 97.0  
2006 Commercial Samples (Q1-4)   Precision 5/2007 NS 99 1.01 90.9  
2006 Autumn Survey (200610) & 2007 Spring Survey (200703)   Precision 5/2007 NS 100 1.61 92.0  
Cod Reference Collection GB Accuracy 5/2006 NS 45 3.85 86.7  
2006 Spring Survey (200604)   Precision 5/2006 NS 50 0.19 98.0  
2005 Commercial Samples (Q1-4)   Precision 5/2006 NS 80 1.20 93.8  
2005 Autumn Survey (200510)   Precision 5/2006 NS 50 0.22 98.0  
2004 Commercial Samples (Q1-4) GOM Precision 7/2005 NS 112 0.75 93.8  
2003 DFO Commercial samples (Q4) & 2004 DFO Observer Samples (Q3) GB Exchange Spring 2005 NM/NS vs. BH 50 0.88 94.0  
2004 DFO Spring Survey (TEM2004004) GB Exchange Spring 2005 NM/NS vs. BH 50 1.98 84.0 n/s
2004 Commercial Samples (Q2) GB Exchange Spring 2005 NM/NS vs. BH 51 3.59 80.4 n/s
2004 Autumn Survey (200407) GB Exchange Spring 2005 NM/NS vs. BH 49 2.59 85.7 n/s
Cod Reference Collection GB Accuracy 6/2005 NM 106 1.53 90.6  
2003 Commercial Samples (Q4) GOM Precision 4/2005 NS 105 2.68 85.7 0.021
2004 Autumn Survey (200407) GOM Precision 2/2005 NM vs. NS 60 0.00 100.0  
Cod Reference Collection GB Accuracy 6/2004 NS 99 1.94 90.9  
2002 DFO Commercial Samples (Q3-4) GB Exchange Winter 2003-2004 NM/NS vs. BH 46 2.60 78.3 n/s
2003 DFO Spring Survey (NED2003002) GB Exchange Winter 2003-2004 NM/NS vs. BH 47 5.26 68.1 n/s
2002 Commercial Samples (Q1) GB Exchange Winter 2003-2004 NM/NS vs. BH 46 2.40 89.1 n/s
2002 Autumn Survey (200209) GB Exchange Winter 2003-2004 NM/NS vs. BH 52 3.83 88.5 n/s


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