研究一下

GNU PSPP

PSPP is a program for statistical analysis of sampled data. It is a Free replacement for the proprietary program SPSS, and appears very similar to it with a few exceptions.

A brief list of some of the features of PSPP follows:

• Supports over 1 billion cases.
• Supports over 1 billion variables.
• Syntax and data files are compatible with SPSS.
• Choice of terminal or graphical user interface.
• Choice of text, postscript or html output formats.
• Inter-operates with Gnumeric, OpenOffice.Org and other free software.
• Easy data import from spreadsheets, text files and database sources.
• Fast statistical procedures, even on very large data sets.
• No license fees.
• No expiration period.
• No unethical “end user license agreements”.
• Fully indexed user manual.
• Free Software; licensed under GPLv3 or later.
• Cross platform; Runs on many different computers and many different operating systems.

The R Project

R is a language and environment for statistical computing and graphics. It is a GNU project which is similar to the S language and environment which was developed at Bell Laboratories (formerly AT&T, now Lucent Technologies) by John Chambers and colleagues. R can be considered as a different implementation of S. There are some important differences, but much code written for S runs unaltered under R.

R provides a wide variety of statistical (linear and nonlinear modelling, classical statistical tests, time-series analysis, classification, clustering, …) and graphical techniques, and is highly extensible. The S language is often the vehicle of choice for research in statistical methodology, and R provides an Open Source route to participation in that activity.

One of R’s strengths is the ease with which well-designed publication-quality plots can be produced, including mathematical symbols and formulae where needed. Great care has been taken over the defaults for the minor design choices in graphics, but the user retains full control.

R is available as Free Software under the terms of the Free Software Foundation‘s GNU General Public License in source code form. It compiles and runs on a wide variety of UNIX platforms and similar systems (including FreeBSD and Linux), Windows and MacOS.