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Command lines entered at the console are limited Under many versions of UNIX and on Windows, R provides a mechanism for recalling and re-executing previous commands.The vertical arrow keys on the keyboard can be used to scroll forward and backward through a key or added with the other keys.
Thus whereas SAS and SPSS will give copious output from a regression or discriminant analysis, R will give minimal output and store the results in a fit object for subsequent interrogation by further R functions.We prefer to think of it of an environment within which many classical and modern statistical techniques have been implemented.A few of these are built into the base R environment, but many are supplied as family of Internet sites (via https://CRAN. More details on packages are given later (see Packages). Many users will come to R mainly for its graphical facilities. We would like to extend warm thanks to Bill Venables (and David Smith) for granting permission to distribute this modified version of the notes in this way, and for being a supporter of R from way back. This should give some familiarity with the style of R sessions and more importantly some instant feedback on what actually happens.