Free ENBIS webinar by Christian Ritter: Skeletons on Flying Carpets

12 February 2014; 12:45 – 13:30; Webinar

Christian Ritter will show the Magic of Dual Response Graphs in an ENBIS webinar on February 12. The webinar is free but registration is required since the number of participants is limited to 25. The moderator of the webinar is Jacqueline Asscher.

Skeletons on Flying Carpets: About the Magic of Dual Response Graphs

The curse of dimensionality gets us often: several factors affect responses in non-trivial ways, the associated models are full of effects, some more significant than others, and we struggle to communicate what they all mean. Sometimes, though, dual response graphs provide a miraculous way out of this mess.

There are two kinds of dual response graphs, skeletons and flying carpets. Skeleton graphs start with a profile of the most influential explanatory variable in two quite different responses. Progressively, the effects of further explanatory variables are grafted onto this 'backbone'. Interactions can be integrated by multiplying grafting points. The resulting display resembles a skeleton and shows all the important relationships in one glance. Flying carpets are more common: They are arrangements of two dimensional manifolds in dual response space and show the joint variation of two explanatory variables within a chosen range. They can also be replicated with respect to other explanatory variables. The resulting display shows the image of a cube in the space of the explanatory variables in the response space. Both skeleton graphs and flying carpets stimulate thinking about the subject matter without passing through mathematical and statistical aspects of fitting the individual response models.

In this webinar, I shall give examples of one skeleton and one flying carpet arrangement in a practical context. Currently, no commercial software includes these displays explicitly although they can be created with various tools. The examples shown in this webinar are created in the R language.