Projections of high-dimensional data onto low-dimensional subspaces pr
ovide insightful views for understanding multivariate relationships. T
his article discusses how to manually control the variable contributio
ns to the projection. The user has control of the way a particular var
iable contributes to the viewed projection and can interactively adjus
t the variable's contribution. These manual controls complement the au
tomatic views provided by a grand tour, or a guided tour, and give gre
atly improved flexibility to data analysts.