ABSTRACT

Modem computerized data analysis builds on advances in com­ puter technology and statistical methodology. Computing environments specifically designed for data analysis have evolved since the 60’s on computing platforms that reflect the state of the art in computing tech­ nology: first mainframes, then personal computers, and now worksta­ tions. Such environments incorporate aspects of data analysis that in­ clude model identification, diagnostic checking, transformation and the usual inferential procedures (Thisted, 1986; Huber, 1987). Becker et al. (1987) specify requirements for computerized dynamic graphics meth­ ods that include identification, deletion, linking, brushing, scaling, and rotation. These techniques are briefly defined below and some of them are then illustrated in Figures 11. la-11.1c with data from Case Study 2.