The LAB Fit is a software for Windows developed for
treatment and analysis of experimental data. At LABFit
program you are able to:

1) Treat similar data;
2) Treat non-similar data;
3) Determine propagated error;
4) Plot 2D and 3D graph;
5) Execute math calculations (system of linear
equations, roots of function, differential equation,
system of differential equations, etc);
6) Extract data (x;y) from a 2D graph;
7) Curve Fit (almost 500 functions at the library,
with 1 and 2 independent variables, functions finder,
option that let you write the fit function, rejection
of data, confidence and prediction bands).

The LAB Fit has a menu for curve fitting and the main
programs of this menu use nonlinear regression. The
LABFit fits functions of one and several independent
variables (from 1 up to 6), admitting uncertainties at
the dependent variable (Y) and also at the independent
variables (X). At the LAB Fit library there are more
than 200 functions of one independent variable and
almost 280 functions with two independent variables.
The user disposes of a finder functions program. If
necessary, there is an option so that the user can
write its own fit function. Once determined the fit
parameters, it's possible to extrapolate the fit
function and, for the 2D and 3D cases, the graph of
the obtained function is shown. For the 2D case,
beyond the extrapolation possibility, the user can
even include error bars and confidence bands to the
graph. The LAB Fit has also a menu destined to the
treatment of similar data, non-similar data and error
propagation. Beyond that, there is a third menu with
general tools like to plot a function informed by user.

And more: the LAB Fit (V 7.2.22 and later) has a
reading option used for to extract data from a 2D
graph (digitizer for orthogonal and nonorthogonal
axes) contained in a graphic file (graph digitizing).

Download (3008 KB) Website Link to this page