Comparing Measurement Device Reliability
Author Information
Author(s): Shoukri Mohamed M, Colak Dilek, Kaya Namik, Donner Allan
Primary Institution: Department of Epidemiology and Biostatistics, Schulich School of Medicine, University of Western Ontario, London, Ontario, Canada
Hypothesis
Can we develop methods to compare the reproducibility of two measurement devices using the same subjects?
Conclusion
The methodology developed allows for effective comparison of the reproducibility of two measuring instruments, showing that the Wald's test and likelihood ratio test are powerful tools for this purpose.
Supporting Evidence
- The Wald test is as powerful as the likelihood ratio test.
- Both tests have greater power than the score test.
- The methodology was illustrated using data from microarray gene expressions and CAT scans.
Takeaway
This study helps us understand how to check if two devices measure things reliably by comparing their results on the same people.
Methodology
The study developed several statistical tests, including the Wald test and likelihood ratio test, to compare the within-subject coefficients of variation from two measurement devices.
Limitations
The statistical properties may not be appropriate in small samples, and the methods assume normality in the data.
Participant Demographics
50 psychiatric patients were involved in the study.
Statistical Information
P-Value
p<0.001
Confidence Interval
(0.28, 0.39)
Statistical Significance
p<0.001
Digital Object Identifier (DOI)
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