![]() These tend to be more flexible, but have a much steeper leaning curve. Others, such as SAS offered by the SAS Institute, have a command line interface (CLI) that requires commands to be typed in using the keyboard. ![]() ![]() Some of the packages, like IBM SPSS Statistics, use a graphical user interface (GUI) that allows users to interact with the program through graphical icons, pull-down menus, dialog boxes, and so on. In addition there are over 30 open-source packages and 10 are either public domain or freeware. Wikipedia, for example, lists over 50 different commercial statistical packages, many of which are general statistical packages, while some are more specialized, for example on data mining, visual analytics, statistical modelling, econometric analysis or time series. The former handle numerical datasets by applying variable-based and, less frequently, case-based analyses. Computer programs relevant to the analysis of non-experimental datasets fall into two main groups: statistical packages and survey analysis packages.
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