Conditional Visualization for Statistical Models: An Introduction to the   condvis Package in R
  The condvis package is for interactive visualization of sections in data space, showing fitted models on the section, and observed data near the section. The primary goal is the interpretation of complex models, and showing how the observed data support the fitted model. There is a video accompaniment to this paper available at https://www.youtube.com/watch?v=rKFq7xwgdX0. This is a preprint version of an article to appear in the Journal of Statistical Software. 
Mark O'Connell, Catherine B. Hurley, Katarina Domijan
stat.OT