ANOVA e o Delineamento Experimental

ANOVA e o Delineamento Experimental
(…) Statistically, in any study involving the comparison of two groups of individuals, there are three sources of variation (or error). These are 'between group' representing real differences between the two samples, 'between individual', representing biological variation and 'within individual', representing the measurement error. Although it is the first of these which is normally of interest, any measurement of it will be influenced by the other two. The best measure of between groups variation is the difference between means, with uncertainty (due to sampling) quantified by the standard error of this difference. The appropriate measure of within group variability is the standard deviation between individuals, whilst the appropriate measure of measurement error is the within patient standard deviation. A general framework encompassing all three is the analysis of variance. Fonte: A comparative assessment of cephalometric errors. Joanna M. Battagel. European Journal of Orthodontics 15 (1993) 305-314 (página 305)
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(…) Statistically, in any study involving the comparison of two groups of individuals, there are three sources of variation (or error).
(1º) These are 'between group' representing real differences between the two samples,
(2º)'between individual', representing biological variation and (3º) 'within individual', representing the measurement error.
Although it is the first of these ('between group') which is normally of interest, any measurement of it will be influenced by the other two ('between individual' com biological variation e 'within individual com ‘ measurement error ').
The best measure of between groups variation is the difference between means, with uncertainty (due to sampling) quantified by the standard error of this difference.
The appropriate measure of