<s>
OpenMx	B-Application
is	O
an	O
open	B-Application
source	I-Application
program	O
for	O
extended	O
structural	O
equation	O
modeling	O
.	O
</s>
<s>
It	O
runs	O
as	O
a	O
package	O
under	O
R	B-Language
.	O
Cross	B-Operating_System
platform	I-Operating_System
,	O
it	O
runs	O
under	O
Linux	O
,	O
Mac	O
OS	O
and	O
Windows	O
.	O
</s>
<s>
OpenMx	B-Application
consists	O
of	O
an	O
R	B-Language
library	O
of	O
functions	O
and	O
optimizers	O
supporting	O
the	O
rapid	O
and	O
flexible	O
implementation	O
and	O
estimation	O
of	O
SEM	O
models	O
.	O
</s>
<s>
The	O
current	O
version	O
is	O
OpenMx	B-Application
2	O
,	O
and	O
is	O
available	O
on	O
CRAN	O
.	O
</s>
<s>
Path	O
analysis	O
,	O
Confirmatory	B-Algorithm
factor	I-Algorithm
analysis	I-Algorithm
,	O
Latent	O
growth	O
modeling	O
,	O
Mediation	O
analysis	O
are	O
all	O
implemented	O
.	O
</s>
<s>
The	O
program	O
has	O
parallel	O
processing	O
built-in	O
via	O
links	O
to	O
parallel	O
environments	O
in	O
R	B-Language
,	O
and	O
in	O
general	O
takes	O
advantage	O
of	O
the	O
R	B-Language
programming	I-Language
environment	O
.	O
</s>
<s>
For	O
models	O
that	O
are	O
better	O
suited	O
to	O
description	O
in	O
terms	O
of	O
matrix	O
algebra	O
,	O
this	O
is	O
done	O
using	O
similar	O
functional	O
extensions	O
in	O
the	O
R	B-Language
environment	O
,	O
for	O
instance	O
mxMatrix	O
and	O
mxAlgebra	O
.	O
</s>
<s>
The	O
code	O
below	O
shows	O
how	O
to	O
implement	O
a	O
simple	O
Confirmatory	B-Algorithm
factor	I-Algorithm
analysis	I-Algorithm
in	O
OpenMx	B-Application
,	O
using	O
either	O
path	O
or	O
matrix	O
formats	O
.	O
</s>
