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Table 2 Study quality criteria

From: Comparison of methods for measuring and assessing carbon stocks and carbon stock changes in terrestrial carbon pools. How do the accuracy and precision of current methods compare? A systematic review protocol

Question   YES NO UNSURE
1 Does the study provide a comparison ofperformance of alternative methods? If YES, it is a comparative study. If NO, it is a single method study.    
FOR COMPARATIVE STUDIES ONLY
1.1 Is the comparator method used appropriate? (e.g., used in context where it was originally developed for use with regard to spatial scale,land use, etc.)[the question does not preclude use of innovative methods applied in a new field]    
1.2 Were the alternative methods applied to thesame location? (excluding chronosequence studies for carbon stock changes)    
1.3 Were the alternative methods applied within a reasonable time frame? (e.g., month, growing season)    
FOR ALL STUDIES
2. Are the accuracy and precision statistics (e.g., means, variances) of methods provided?    
3. Does the study report on other variables that may have influenced the accuracy, precision, validity or repeatability of the methods?    
FURTHER CRITERIA FOR STUDIES SCORING "YES" FOR QUESTIONS 1-3
4. Are the locations for measurements clearly identified?    
5. Are all data points included in the analyses?