By Andrew Rutherford

Conventional techniques to ANOVA and ANCOVA are actually being changed by means of a common Linear Modeling (GLM) procedure. This ebook starts with a quick heritage of the separate improvement of ANOVA and regression analyses and demonstrates how either research types are subsumed by means of the final Linear version. an easy unmarried self sufficient issue ANOVA is analysed first in traditional phrases after which back in GLM phrases to demonstrate the 2 techniques. The textual content then is going directly to disguise the most designs, either self reliant and comparable ANOVA and ANCOVA, unmarried and multi-factor designs. the traditional statistical assumptions underlying ANOVA and ANCOVA are designated and given expression in GLM phrases. choices to standard ANCO

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Additional resources for Introducing Anova and Ancova: A GLM Approach (Introducing Statistical Methods series)

Example text

The comparison of full and reduced GLMs applies a distilled form of linear modelling processes to the analysis of experimental data. In Chapter 1, the GLM conception was described as data ˆ model ‡ error (1X1, rptd) Usually linear modelling processes attempt to identify the ``best'' GLM of the data by comparing different linear models. As in experimental analyses, these GLMs are assessed in terms of the relative proportions of data variance attributed to model and error components. Given a ®xed data set and because the sum of the model and error components (the data variance) is a constant, clearly any increase in variance accommodated by the model component will result in an equivalent decrease in the error component.

5 illustrates the calculation of error terms and how they provide the error SS. 22) provides the MSe. 5 Calculation of error terms, their square and sums å ij å1,1 å2,1 å3,1 å4,1 å5,1 å6,1 å7,1 å8,1 å9,2 å10,2 å11,2 å12,2 å13,2 å14,2 å15,2 å16,2 å17,3 å18,3 å19,3 å20,3 å21,3 å22,3 å23,3 å24,3 € ì j À Yij ˆ ˆ ˆ ˆ ˆ ˆ ˆ ˆ ˆ ˆ ˆ ˆ ˆ ˆ ˆ ˆ ˆ ˆ ˆ ˆ ˆ ˆ ˆ ˆ 6À7 6À3 6À6 6À6 6À5 6À8 6À6 6À7 10 À 7 10 À 11 10 À 9 10 À 11 10 À 10 10 À 10 10 À 11 10 À 11 11 À 8 11 À 14 11 À 10 11 À 11 11 À 12 11 À 10 11 À 11 11 À 12 åij ˆ ˆ ˆ ˆ ˆ ˆ ˆ ˆ ˆ ˆ ˆ ˆ ˆ ˆ ˆ ˆ ˆ ˆ ˆ ˆ ˆ ˆ ˆ ˆ (å ij )2 À1 3 0 0 1 À2 0 À1 3 À1 1 À1 0 0 À1 À1 3 À3 1 0 À1 1 0 À1 1 9 0 0 1 4 0 1 9 1 1 1 0 0 1 1 9 9 1 0 1 1 0 1 0 52 28 INTRODUCING ANOVA AND ANCOVA: A GLM APPROACH basis for partitioning variance in traditional ANOVA.

Essentially, it presumes that subjects' dependent variable scores (data) are best described by the experimental condition means. The full GLM manifests the data description under a non-directional experimental hypothesis. This may be expressed more formally as á j Tˆ 0 for some j (2X28) 30 INTRODUCING ANOVA AND ANCOVA: A GLM APPROACH which states that the effects of all of the experimental conditions do not equal zero. An equivalent expression in terms of the experimental condition means is ì Tˆ ì j for some j (2X29) which states that some of the experimental condition means do not equal the grand mean.

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