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2-Way Mixed Effects ANOVA
Comparison of 6 Breath Alcohol Testing Machines in 3 Subjects R.G. Gullberg (2008). "Employing Components-of-Variance to Evaluate Forensic Breath Test Instruments," Science and Justice, Vol. 48, pp. 2-7
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Data Description and Statistical Model
Experiment was conducted to compare 6 breath alcohol machines in 3 subjects, with 10 measurements per subject per machine Factor A – Machine with 6 Levels (Fixed Factor) Factor B – Subject with 3 Levels (Random Factor) Response – Blood Alcohol Concentration =Legal Limit
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Analysis of Variance I – Expectations and Variances
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Analysis of Variance I – Expectations and Variances
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