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A design for APL software for man-machine dialogue with statistical applications

Encouraged by the popularity of interactive computing and technical advances in time-sharing, computer users are increasingly turning to the development of interactive applications. In particular, statistical computing in APL has attracted its share of interest
 In this paper we will discuss the design of a control structure for a class of interactive applications. We then discuss the method of using the control structure in statistical applications. We also give special attention to XYPAK, a workspace for bivariate analysis that uses the general control structure.