<s>
PSPP	B-Language
is	O
a	O
free	B-Application
software	I-Application
application	O
for	O
analysis	O
of	O
sampled	O
data	O
,	O
intended	O
as	O
a	O
free	O
alternative	O
for	O
IBM	B-Algorithm
SPSS	I-Algorithm
Statistics	I-Algorithm
.	O
</s>
<s>
It	O
has	O
a	O
graphical	B-Application
user	I-Application
interface	I-Application
and	O
conventional	O
command-line	B-Application
interface	I-Application
.	O
</s>
<s>
It	O
is	O
written	O
in	O
C	B-Language
and	O
uses	O
GNU	B-Application
Scientific	I-Application
Library	I-Application
for	O
its	O
mathematical	O
routines	O
.	O
</s>
<s>
This	O
software	O
provides	O
a	O
comprehensive	O
set	O
of	O
capabilities	O
including	O
frequencies	O
,	O
cross-tabs	O
comparison	O
of	O
means	O
(	O
t-tests	B-General_Concept
and	O
one-way	B-General_Concept
ANOVA	I-General_Concept
)	O
,	O
linear	O
regression	O
,	O
logistic	O
regression	O
,	O
reliability	O
(	O
Cronbach	O
's	O
alpha	O
,	O
not	O
failure	O
or	O
Weibull	O
)	O
,	O
and	O
re-ordering	O
data	O
,	O
non-parametric	O
tests	O
,	O
factor	O
analysis	O
,	O
cluster	O
analysis	O
,	O
principal	O
components	O
analysis	O
,	O
chi-square	O
analysis	O
and	O
more	O
.	O
</s>
<s>
At	O
the	O
user	O
's	O
choice	O
,	O
statistical	O
output	O
and	O
graphics	O
are	O
available	O
in	O
ASCII	B-Protocol
,	O
PDF	B-Application
,	O
PostScript	B-Language
,	O
SVG	B-Application
or	O
HTML	B-Language
formats	O
.	O
</s>
<s>
A	O
range	O
of	O
statistical	O
graphs	O
can	O
be	O
produced	O
,	O
such	O
as	O
histograms	B-Algorithm
,	O
pie-charts	B-Application
,	O
scree	B-Application
plots	I-Application
,	O
and	O
np-charts	B-Application
.	O
</s>
<s>
PSPP	B-Language
can	O
import	O
Gnumeric	B-Language
and	O
OpenDocument	B-Application
spreadsheets	I-Application
,	O
Postgres	B-Application
databases	O
,	O
comma-separated	O
values	O
and	O
ASCII	B-Protocol
files	I-Protocol
.	O
</s>
<s>
It	O
can	O
export	O
files	O
in	O
the	O
SPSS	B-Algorithm
'	O
portable	O
 '	O
and	O
'	O
system	O
 '	O
file	O
formats	O
and	O
to	O
ASCII	B-Protocol
files	I-Protocol
.	O
</s>
<s>
Some	O
of	O
the	O
libraries	O
used	O
by	O
PSPP	B-Language
can	O
be	O
accessed	O
programmatically	O
;	O
provides	O
an	O
interface	O
to	O
the	O
libraries	O
used	O
by	O
PSPP	B-Language
.	O
</s>
<s>
The	O
PSPP	B-Language
project	O
(	O
originally	O
called	O
"	O
Fiasco	O
"	O
)	O
was	O
born	O
at	O
the	O
end	O
of	O
the	O
1990s	O
as	O
a	O
free	B-Application
software	I-Application
replacement	O
for	O
SPSS	B-Algorithm
,	O
which	O
is	O
a	O
data	O
management	O
and	O
analysis	O
tool	O
,	O
at	O
the	O
time	O
produced	O
by	O
SPSS	B-Algorithm
Inc	O
.	O
</s>
<s>
The	O
nature	O
of	O
SPSS	B-Algorithm
's	O
proprietary	B-Application
licensing	O
and	O
the	O
presence	O
of	O
digital	O
restrictions	O
management	O
motivated	O
the	O
author	O
to	O
write	O
an	O
alternative	O
which	O
later	O
became	O
functionally	O
identical	O
,	O
but	O
with	O
permission	O
for	O
everyone	O
to	O
copy	O
,	O
modify	O
and	O
share	O
.	O
</s>
<s>
In	O
the	O
book	O
"	O
SPSS	B-Algorithm
For	O
Dummies	O
"	O
,	O
the	O
author	O
discusses	O
PSPP	B-Language
under	O
the	O
heading	O
of	O
"	O
Ten	O
Useful	O
Things	O
You	O
Can	O
Find	O
on	O
the	O
Internet	O
"	O
.	O
</s>
<s>
Another	O
review	O
of	O
free	O
to	O
use	O
statistical	O
software	O
also	O
finds	O
that	O
the	O
statistical	O
results	O
from	O
PSPP	B-Language
match	O
statistical	O
results	O
for	O
SAS	O
,	O
for	O
frequencies	O
,	O
means	O
,	O
correlation	O
and	O
regression	O
.	O
</s>
<s>
One	O
study	O
found	O
that	O
students	O
who	O
used	O
PSPP	B-Language
became	O
more	O
positive	O
about	O
learning	O
statistics	O
while	O
using	O
PSPP	B-Language
.	O
</s>
<s>
Among	O
the	O
studies	O
using	O
PSPP	B-Language
are	O
one	O
about	O
posttraumatic	O
stress	O
in	O
adolescents	O
,	O
another	O
about	O
nutrition	O
software	O
,	O
and	O
another	O
about	O
internet	O
addiction	O
.	O
</s>
