Perceptual maps and multidimensional scaling - Multidimensional scaling models - How to determine dimensionality
3 important questions on Perceptual maps and multidimensional scaling - Multidimensional scaling models - How to determine dimensionality
What is the goal of MDS?
How do you determine the number of dimensions to use for when the measure of fit is a "badness of fit"? Why?
- Plot the fit measure vs the number of dimensions, then take the number below (or to the right of) the break in the curve.
- This is because at that point stress is reduced a lot to the point that taking additional dimensions does not help anymore.
How do you determine the number of dimensions to use for when the measure of fit is a "goodness of fit"? Why?
- Plot the fit measure vs the number of dimensions, then take the number above (or to the left of) the break in the curve.
- This is because 3 dimensions explains more variation than 1 or 2 dimensions, while the amount of variation explained by the 4th or 5th dimension is minuscule.
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