This re-analysis of Tobin's (l950)study makes three points: (1) graphs are a powerful device for discovery and for communication, and can reveal much of the information in the data; (2) squeezing out the more subtle multivariate messages requires some solution to the usual overparameterization...

This paper presents a more complete theory of data analysis which allows for changes in the state of mind of the observer and also for approximations that limit planning costs. Discussion is included on the form that criticism should take, and the extent to which planned responses to the data...