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GNU PSPP Screenshots
This page demonstrates some of PSPP's capabilities and the various ways it can be used.It's not intended to be a tutorial, or a substitute for the reference manual, but a brief demonstration of what PSPP can do.
Ing and simulation tools for soft robotics. Section3contains the theoretical foundation of our framework. Section5explains how direct and inverse models are implemented. Section6contains implementation aspects related to the SOFA plugin and Section7 presents examples of soft robots modeled and simulated with our framework.
Note: This page is graphics heavy! Click on any of the images to see large scale versions.
- Ways of using PSPP
Compatibility
PSPP is designed as a Free replacement for SPSS.That is to say, it behaves as experienced SPSS users would expect, and theirsystem files and syntax files can be used in PSPP with little or no modification, and will produce similar results (the actual numbers should be identical).The number of variables and cases is limited only by the computerarchitecture.
In a few instances, the default behaviour of PSPP differs where the developers believe enhancements are desirable orit makes sense to do so, but this can be overridden by the user if desired.
Ways of Using PSPP
PSPP can be used in several different modes, depending on the requirements, experience and preference of the user.
Terminal Mode
One way to use PSPP is from a terminal.This method avoids cluttering your screen with a lot of dialog boxes,menus and other windows.If you are familiar with the PSPP syntax, then thisis the simplest way to use the program.If your terminal has cursor keys, they behave in PSPP in an intuitive manner.You can also use the HOST command to temporarily return to the shell at any time.Your session is logged to a file, so that you can review it later.PSPP is designed to handle very large volumes of data.Larger even than the virtual memory of the computer.
Graphic User Interface
Users familiar with other software may prefer the graphic user interface,which allows you to define data without needing to become familiar with the PSPP syntax.However, instead one must remember lots of menu and button click sequences.Data can be entered from the keyboard, cut-and-pasted from spreadsheet applications or imported from existing files.To start the graphic user interface, type psppire from your terminal, or use the menu item provided by the operating system.
There is a spreadsheet type data entry window for the entry and viewing of data and its meta data.
Drop down menus provide access to the supported statistical analyses and transformations, in addition to operations such as loading and saving of the data and syntax files.You can use the features via interactive dialog boxes which indicate the options and required parameters of each command.Whilst the drop-down menus and dialogs are useful for many analyses, the syntax mechanism provides a more powerful and flexible means of controlling PSPP.In order to assist users creating syntax files, each dialog can optionally print its syntax into a separate window for later execution.
Non Interactive Mode
There is also a non-interactive mode of operation. This is useful for longer analyses which you want to perform again and again.You can choose many different formats to save the results of your analyses.Available output formats include:
| Plain Ascii Text | Simple but effective, and very portable. |
| Unicode Text with UTF-8 encoding | Aesthetically pleasing and works on most modern computers. |
| Great for printed documents, but requires a reader to view it. | |
| ODT | The standard of office suite software. |
| HTML | Great if you want to put your reports on a website. |
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This mode can also be used as part of a wider system, such as automated creation and processing of data files for online display.
Data Visualisation
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PSPP can generate high quality plots to help with visualisation of thedistribution of data.Among the type of plots which can be displayed are box-and-whisker plots,normal probability plots and histograms.These complement descriptive statistics and help determine the most appropriate type of analysis for the data, and/or what transformations are necessary.The data selectioncapabilities of PSPP make it simple to generate plots from a subset of variables or from data which match only certain criteria.
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Plots and graphs created by PSPP are formatted in standard file formats such as postscript or PNG, so as to allow easy import into reports or other documents.
Data Manipulation
Recoding and manipulation of data can be achieved rapidly using PSPPtransformations.Transformations enable you to specify operations without needing an extra iteration through the data.Operations may comprise simple boolean criteria, arithmetic expressions and mathematical functions.PSPP supports many math functions, including random number distributions, trigonometry and date-time conversions.Transformations may be cascaded, so that many operations can be applied concurrently.Like other operations, the data manipulation features can be performed using either the syntax commands or through interactive dialog boxes.