Comparing Two Measurement Devices. Brian Novatny 2003. Each measurement made by an instrument or measuring device consists of the true, unknown level of the characteristic or item measured plus an error of measurement.
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Comparing Two Measurement Devices
Each measurement made by an instrument or measuring device consists of the true, unknown level of the characteristic or item measured plus an error of measurement.
In practice it is important to know whether or not the variance in errors of measurement of an instrument, or the imprecision of measurement, is suitably small as compared to the variance of the characteristic or product measured, or the product variability.
For efficiency of the measuring process, the variance in errors of measurement should be several or many times smaller than the variability of the characteristic measured or product variance.
High measurement error causes the power of most statistical tests to decrease unless compensated for by larger sample sizes
Power = 1 - Beta
Beta is the Type II error
Device1 Device2 Sum Diff
5.00 4.73 9.73 0.27
5.17 4.83 10.00 0.33
5.17 4.63 9.80 0.53
5.00 4.37 9.37 0.63
8.50 7.03 15.53 1.47
5.67 4.50 10.17 1.17
8.00 7.03 15.03 0.97
9.00 7.93 16.93 1.07
8.50 7.50 16.00 1.00
11.17 9.57 20.73 1.60
9.00 7.70 16.70 1.30