<s>
XLispStat	B-Algorithm
is	O
a	O
statistical	O
scientific	O
package	O
based	O
on	O
the	O
XLISP	B-Language
language	O
.	O
</s>
<s>
Many	O
free	O
statistical	O
software	O
like	O
(	O
nonlinear	O
curve	O
fitting	O
problems	O
)	O
and	O
ViSta	B-Algorithm
are	O
based	O
on	O
this	O
package	O
.	O
</s>
<s>
XLispStat	B-Algorithm
has	O
seen	O
usage	O
in	O
many	O
fields	O
,	O
including	O
astronomy	O
,	O
GIS	O
,	O
speech	O
acoustics	O
,	O
econometrics	O
,	O
and	O
epidemiology	O
.	O
</s>
<s>
XLispStat	B-Algorithm
was	O
historically	O
influential	O
in	O
the	O
field	O
of	O
statistical	O
visualization	O
.	O
</s>
<s>
XLispStat	B-Algorithm
dates	O
to	O
the	O
late	O
1980s/early	O
1990s	O
and	O
probably	O
saw	O
its	O
greatest	O
popularity	O
in	O
the	O
early-to-mid	O
1990s	O
with	O
greatly	O
declining	O
usage	O
since	O
.	O
</s>
<s>
In	O
the	O
1990s	O
it	O
was	O
in	O
very	O
widespread	O
use	O
in	O
statistical	O
education	O
,	O
but	O
has	O
since	O
been	O
mostly	O
replaced	O
by	O
R	B-Language
.	O
There	O
is	O
a	O
paper	O
explaining	O
why	O
UCLA	O
's	O
Department	O
of	O
Statistics	O
abandoned	O
it	O
in	O
1998	O
,	O
and	O
their	O
reasons	O
for	O
doing	O
so	O
likely	O
hold	O
true	O
for	O
many	O
other	O
of	O
its	O
former	O
users	O
.	O
</s>
