Today’s
software review PSPP, an SPSS clone.
PSPP
is a statistical software package that offers compatibility with SPSS
(Statistical Package for the Social Sciences). SPSS is a well known
statistical software package that is used in junior college stats
classes, for econ majors in college or even for doctoral candidates
doing research. Both SPSS and PSPP are for statisticians, social
scientists and students requiring easy analysis of sampled data. The
following is a quick and dirty comparison of the two applications.
PSPP 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.

Interoperates with Gnumeric, LibreOffice. 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 Windows, Mac and Unixlike systems.
Further
PSPP offers the following functionality:

Descriptive statistics, cross tabs and other data exploration features

ttests (one sample, independent samples and paired samples)

One way ANOVA

Chisquare and binomial tests

Bivariate correlations

Linear regression

Factor analysis

Reliability analysis

ROC curves
SPSS
on the other hand has a variety of tools that easily outnumber the
functionality found in PSPP. Here is a sample of SPSS core feature
set.

Data transformations

Data Examination

Descriptive Statistics

Contingency tables

Reliability tests

Correlation

T tests

ANOVA

MANOVA

General Linear Model (Release 7.0 and higher)

Regression

Nonlinear Regression

Logistic Regression

Loglinear Regression

Discriminant Analysis

Factor Analysis

Cluster analysis

Multidimensional scaling

Probit analysis

Forecasting/Time Series

Survival analysis

Nonparametric analysis

Graphics and graphical interface
On
the surface some would argue that PSPP isn’t ready for prime
time,
given that SPSS has many more features. But keep in mind
that for
the vast majority of users, PSPP provides all the basic
functionality
that a typical user would need. Furthermore, PSPP is
compatible with
SPSS proprietary file format, so a user could use
PSPP to manipulate
SPSS files. For those who need functionality
that goes beyond PSPP,
there are free alternatives that are better
that SPSS. One free
statistical application of note is R, which is a
programming language
that is designed for statistical computing.
For the minority of
users who want total and complete control of
data analysis and data
mining, R is considered by many best of
breed in the field of
statistical computing. For the rest of us, PSPP
is a free
alternative to SPSS worth considering. Oh, by the way . . .
did I
mention that PSPP is free. Give it a try!