Abstract
Various form of MDS are discussed: Ordinal MDS, metric MDS, MDS with different distance functions, MDS for more than one proximity value per distance, MDS for asymmetric proximities, individual differences MDS models, and unfolding.
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Notes
- 1.
The distance of a point \(i\) from the origin in Indscal’s subject space represents the goodness of the Indscal solution for person \(i\). Figure 5.5 therefore exhibits that, for example, the data of person 1 are only relatively poorly explained by the Indscal solution, while the opposite is true for persons 10, 7, or 11.
- 2.
This program is included in the NewMDSX package.
- 3.
Note also that if the number of points is small and the dimensionality is high (e.g., if \(n=5\) and \(m=3\)), the model has many free parameters which help to generate a good model fit. For theory construction, such special cases are usually of little interest.
- 4.
Such data express the extent to which \(i\) dominates \(j\) in some sense. For example, dominance could mean “X is better than Y by x units”, “I would vote for A rather than for B”, or “I agree most with X”.
- 5.
Just like folding an umbrella, or like picking up a handkerchief at this point.
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Borg, I., Groenen, P.J., Mair, P. (2013). Variants of Different MDS Models. In: Applied Multidimensional Scaling. SpringerBriefs in Statistics. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-31848-1_5
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