<s>
XLfit	B-Application
is	O
a	O
Microsoft	B-Application
Excel	I-Application
add-in	O
that	O
can	O
perform	O
regression	O
analysis	O
,	O
curve	B-Algorithm
fitting	I-Algorithm
,	O
and	O
statistical	O
analysis	O
.	O
</s>
<s>
It	O
is	O
approved	O
by	O
the	O
UK	O
National	O
Physical	O
Laboratory	O
and	O
the	O
US	O
National	O
Institute	O
of	O
Standards	O
and	O
Technology	O
XLfit	B-Application
can	O
generate	O
2D	O
and	O
3D	O
graphs	O
and	O
analyze	O
data	O
sets	O
.	O
</s>
<s>
XLfit	B-Application
can	O
also	O
analyse	O
the	O
statistical	O
data	O
.	O
</s>
<s>
It	O
includes	O
over	O
seventy	O
linear	O
and	O
non-linear	B-Algorithm
curve	I-Algorithm
fitting	I-Algorithm
models	O
.	O
</s>
<s>
Exponential/Log	O
,	O
Power	O
Series	O
,	O
Sigmoidal	B-Algorithm
,	O
Hyperbolic	O
,	O
Yield	O
Density	O
,	O
Linear	O
,	O
Polynomial	O
,	O
Dose	O
Response	O
,	O
Pharmacology	O
,	O
Equilibrium	O
and	O
Inhibition	O
.	O
</s>
<s>
Levenberg-Marquardt	B-Algorithm
fitting	I-Algorithm
algorithm	I-Algorithm
.	O
</s>
<s>
A	O
range	O
of	O
statistical	O
calculations	O
can	O
also	O
be	O
applied	O
to	O
the	O
data	O
from	O
within	O
the	O
spreadsheet	B-Application
.	O
</s>
<s>
Available	O
statistical	O
models	O
include	O
Spearman	B-General_Concept
's	I-General_Concept
rank	I-General_Concept
correlations	I-General_Concept
,	O
Student	B-General_Concept
's	I-General_Concept
t-test	I-General_Concept
,	O
Mann	B-General_Concept
–	I-General_Concept
Whitney	I-General_Concept
U	I-General_Concept
test	I-General_Concept
,	O
least	B-Algorithm
squares	I-Algorithm
,	O
and	O
ANOVA	B-General_Concept
,	O
among	O
others	O
.	O
</s>
<s>
XLfit	B-Application
was	O
validated	O
by	O
The	O
UK	O
National	O
Physical	O
Laboratory	O
in	O
2004	O
;	O
the	O
unit	O
tests	O
for	O
this	O
are	O
provided	O
in	O
the	O
model	O
editor	O
from	O
version	O
5.4	O
onwards	O
to	O
allow	O
each	O
version	O
to	O
be	O
easily	O
validated	O
.	O
</s>
<s>
XLfit	B-Application
was	O
used	O
by	O
NASA	O
to	O
analyze	O
the	O
battery	O
life	O
of	O
the	O
Curiosity	O
Mars	O
Lander	O
.	O
</s>
<s>
XLift	O
is	O
a	O
proprietary	B-Application
software	I-Application
.	O
</s>
