LAB Fit Curve Fitting Software

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LS Optimizer

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xyExtract Graph Digitizer

Contour Map

2D Parametric Graph

2D Animation

3D Animation


Graphs  Fitting  Statistics  Tools

      Download LABFit   Download Help Files

Written by: Wilton and Cleide Pereira da Silva

Universidade Federal de Campina Grande, DF/CCT
R. Aprigio Veloso, 882, B. Universitario
Campina Grande, Paraiba, 58429-900
Release Date: 09/12/2022
Release Status: Major Update
File Size: 15.3 MB Type: Freeware
Cost: US$ 0.00 (free for you)

LABFit Curve Fit, LABFIT Ajuste de Curvas, Labfit Least Squares, labfit Kurvenanpassung, LabFit treatment of experimental data and LAB FIT Minimos Quadrados.

curve fitting, error propagation, non-linear regression, multivariate, 2D 3D graph, confidence band, basic statistics, least squares, extrapolation, chi-square, correlation coefficient, covariance matrix, differential equation, system of differential equations.

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

1) Treat similar data (grouped and ungrouped dataset, two samples);

2) Treat non-similar data;

3) Calculate probabilities for many distributions (Gaussian, t-Student, Fisher-Snedecor, Chi-Square and Correlation Coefficient);  

4) Determine propagated error (up to eight independent variables);

5) Plot graphs (2D and 3D) (normal, parametric, imported dataset, contour of maps);

6) Execute calculations: system of linear equations, roots of function, nonlinear equation, ordinary differential equation (ODE up to fifth order), system of ordinary differential equations (first order ODE, up to five equations), approached function for ODE solution, calculator, etc;

7) Extract data (x;y) from a 2D graph (digitizing with "xyExtract Graph Digitizer");

8) Curve Fitting (nonlinear regression - least squares method, Levenberg-Marquardt algorithm -, almost 500 functions at the library with one and two independent variables, functions finder, option that let you write your own fitting function with up to 150 characters, 6 independent variables and 10 parameters).

LAB Fit has a menu for curve fitting and the main programs of this menu use nonlinear regression. LAB Fit 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). In case of uncertainties in X and in Y it's made a pre-fit not considering the uncertainties in X, that later on are transferred to Y by error propagation. At LAB Fit library there are more than 200 functions with 1 independent variable and almost 280 functions with 2 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 bar and confidence band to the graph. 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 many other types of calculations.

And more: reading option for to extract data from a 2D graph (digitizer for orthogonal and nonorthogonal axes) contained in a graphic file (graph digitizing).

Contact Info:
General Phone: +55 ( 0 )83 3333-2962
General Email: [email protected]

Support Phone: +55 ( 0 )83 3333-2962
Support Email: [email protected]

Authors Phone: +55 ( 0 )83 3333-2962
Authors Email: [email protected]

Free LAB Fit key: [email protected]

LAB Fit - Images and Graphs (Examples): Graphs

LAB Fit - Curve Fitting (Examples): Fitting

LAB Fit - Basic Statistics (Examples): Statistics

LAB Fit - Tools (Examples): Tools

LAB Fit - Certification:    SRDP / NIST
The LAB Fit performance has been verified with the Statistical Reference Datasets Project (SRDP) of the National Institute of Standards and Technology (NIST). The SRDP presents 27 datasets with three levels of difficulty:

Lower               Average               Higher

All the 27 LAB Fit results are statistically identical to the certified values. All the LAB Fit results are statistically correct...                                   For all the initial values...

Download URLs:
LAB Fit Curve Fitting Software       Help Files

Supported Operating Systems: Win95,Win98,WinME,WinNT 4.x,WinXP,Windows2000
System Requirements: DX2 486, Windows 95, 8 Mb
Install Support: Install and Uninstall