Results of all QA/QC Exercises
for Surfclam, Spisula solidissima

Spisula solidissima


Initials for each age reader are given. All samples were collected by the Northeast Fisheries Science Center (NEFSC). In tests where agreement is below 90%, bias indicates either the P-value of a Bowker’s test or ‘n/s’ (test not significant at the α = 0.05 level).

Sample Source Test Type Date Completed Age Reader Number Aged Number Tested CV (%) Agreement (%) Bias
2015 Clam Survey (201560) Precision 12/2015 BJ 717 100 0.26 94.0  
2012 Clam Survey (201260) Precision 11/2015 BJ 328 70 0.09 97.1  
2013 Clam Survey (201360) Precision 8/2015 BJ 94 35 0.29 94.3  
2011 Clam Survey (201104) Precision 10/2012 BJ 444 95 2.25 72.6 n/s
2008 Clam Survey (200808) Precision 10/2008 BJ 840 100 3.13 76.0 n/s
2005 Clam Survey (200507) Precision 8/2005 BJ 889 141 3.43 65.2 n/s
2002 Clam Survey (200206) Calibration 6/2005 BJ -- 609 1.75 84.2 n/s

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(File Modified Dec. 18 2015)