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curve, fitting, data, plotting, nonlinear, nonlinear regression, curve fitting, regression, modeling, surface fitting, datafitting, data, fitting, least squares, curve fitting, equation, graph, plotter, eqplot, 2d

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DataFit	Oakdale Engineering
Resource Type: Software	Resource Application: Accounting, Finance, Internet
Cost: US$229.00 Pricing Details	System: Win95,Win98,WinME,WinNT 4.x,Windows2000,WinXP,Windows2003
DataFit is a tool used to perform nonlinear regression (curve fitting), statistical analysis and data plotting. What sets DataFit apart from similar curve fitting and regression programs is its ease of use. DataFit is driven by a well-designed graphical interface, so there are no complicated instructions to remember and no programs to write. Data entry is achieved through a standard spreadsheet interface, which supports ASCII and ODBC data source import, as well as cutting and pasting data from the clipboard. With DataFit, you can perform linear or nonlinear regression on data containing up to 20 independent variables. You can choose from more than 600 pre-defined equations, which are commonly used in statistical, scientific and engineering applications, or create your own equations. Solved equations are sorted according to goodness-of-fit. DataFit also includes forward selection, backward elimination, stepwise selection and manual variable selection modes to help determine which independent variables should be included in your regression model for multivariate datasets. Results include completely customizable 2D and 3D plots, fitted parameters with confidence intervals, input vs. estimated data and goodness-of-fit information. Plots can be saved as templates, which allows them to be applied to new plots in order to instantly give them your own custom appearance. Data tables, supporting interpolation and extrapolation (projections), can be exported in ASCII, Excel or HTML format. You can also automatically export source code in BASIC or C to utilize any solved equation in a program that you have written. Macro capability allows curve fitting operations to be performed non-graphically, either in batch mode or by calling DataFit from an external program. With the combination of an intuitive interface, online help and wide range of features, it is a tool that is used effectively by both beginners and experts.
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NLREG	Phillip H. Sherrod
Resource Type: Software	Resource Application: Communication and Presentations, Engineering, Management
Cost: US$195.00 Pricing Details	System: Win95,Win98,WinME,WinXP,WinNT 3.x,WinNT 4.x,Windows2000,Windows2003
NLREG performs nonlinear regression and curve fitting. NLREG fits a mathematical function whose form you specify to a set of data values. Virtually any type of function can be fitted. NLREG includes a programming language similar to C that you use for describing the function to be fitted. Two dimensional line and three dimensional surface plots can be generated. The programming language includes a large selection of built-in library functions (sin, cos, log, exp, etc.) that makes it easy to describe complicated models.
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Regression Analysis - DataFitting	Institute of Mathematics and Statistics
Resource Type: Software	Resource Application:
Cost: US$15.00 Pricing Details	System: Win95,Win98,WinME,WinNT 3.x,WinNT 4.x,Windows2000,WinXP,Windows2003
DataFitting is a powerful statistical analysis program that performs linear and nonlinear regression analysis (i.e. curve fitting). DataFitting determines the values of parameters for an equation, whose form you specify, that cause the equation to best fit a set of data values. DataFitting can handle linear, polynomial, exponential, and general nonlinear functions. DataFitting performs true nonlinear regression analysis, it does not transform the function into a linear form. As a result, it can handle functions that are impossible to linearize such as: y = (a - c) * exp(-b * x) + c Quickly Find the Best Equations that Describe Your Data: DataFitting gives students, teachers, engineers, researchers and other professionals the power to find the ideal model for even the most complex data, by putting a large number of equations at their fingertips. It has built-in library that includes a wide array of linear and nonlinear models from simple linear equations to high order polynomials. Graphically Review Curve Fit Results: Once your data have been fit, DataFitting automatically sorts and plots the fitted equations by the statistical criteria of Standard Error. You can preview your graph and output publication-quality graphs in several different configurations. A residual graph as well as parameter output is generated for the selected fitted equation. Data, statistical and numeric summaries are also available from within the report-panel. DataFitting has the following capabilities: * A 38-digit precision math emulator for properly fitting high order polynomials and rationals. * A robust fitting capability for nonlinear fitting that effectively copes with outliers and a wide dynamic Y data range.
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Equation Graph Plotter - EqPlot	Institute of Mathematics and Statistics
Resource Type: Software	Resource Application:
Cost: US$15.00 Pricing Details	System: Win95,Win98,WinME,WinNT 3.x,WinNT 4.x,Windows2000,WinXP,Windows2003
Graph plotter program plots 2D graphs from complex equations. The application comprises algebraic, trigonometric, hyperbolic and transcendental functions. EqPlot can be used to verify the results of nonlinear regression analysis program. Graphically Review Equations: Equation graph plotter gives engineers and researchers the power to graphically review equations, by putting a large number of equations at their fingertips. The program is also indispensable for students and teachers. Understandable and convenient interface: A flexible work area lets you type in your equations directly. It is as simple as a regular text editor. Annotate, edit and repeat your graphings in the work area. You can also paste your equations into the editor panel. Example of mathematical expression: 5.22 - (2 * x) + square(x) + power(x;3) + power(2.55;4) - logbaseN(4;6.25) Save your work for later use into a text or graphic file. Comprehensive online help is easily accessed within the program. Features: -------- Scientific graphings Unlimited expression length Parenthesis compatible Scientific notation More than 35 functions More than 40 constants User-friendly error messages Simple mode (medium size on desktop) Paste expressions into EqPlot Online documentation *All the benefits that Windows bestows, such as multi-tasking and print formatting are available
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Scientific Calculator - ScienCalc	Institute of Mathematics and Statistics
Resource Type: Software	Resource Application:
Cost: US$15.00 Pricing Details	System: Win95,Win98,WinME,WinNT 3.x,WinNT 4.x,Windows2000,WinXP,Windows2003
ScienCalc is a convenient and powerful scientific calculator. ScienCalc calculates mathematical expression. It supports the common arithmetic operations (+, -, , /) and parentheses. The program contains high-performance arithmetic, trigonometric, hyperbolic and transcendental calculation routines. All the function routines therein map directly to Intel 80387 FPU floating-point machine instructions. Find values for your equations in seconds: Scientific calculator gives students, teachers, scientists and engineers the power to find values for even the most complex equation set. You can build equation set, which can include a wide array of linear and nonlinear models for any application: Linear equations Polynomial and rational equations Nonlinear exponential, logarithmic and power equations Pre-defined mathematical and physical constants Understandable and convenient interface: A flexible work area lets you type in your equations directly. It is as simple as a regular text editor. Annotate, edit and repeat your calculations in the work area. You can also paste your equations into the editor panel. Example of mathematical expression: 5.44E-4 (x - 187) + (2 * x) + square(x) + sin(x/deg) + logbaseN(6;2.77) History of all calculations done during a session can be viewed. Print your work for later use. Comprehensive online help is easily accessed within the program. Features: -------- Scientific calculations Unlimited expression length Parenthesis compatible Scientific notation More than 35 functions More than 40 constants User-friendly error messages Simple mode (medium size on desktop) Paste expressions into ScienCalc Online documentation *All the benefits that Windows bestows, such as multi-tasking and print formatting are available
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Regression Analysis - CurveFitter	Institute of Mathematics and Statistics
Resource Type: Software	Resource Application:
Cost: US$15.00 Pricing Details	System: Win95,Win98,WinME,WinNT 3.x,WinNT 4.x,Windows2000,WinXP,Windows2003
CurveFitter program performs statistical regression analysis to estimate the values of parameters for linear, multivariate, polynomial, exponential and nonlinear functions. The regression analysis determines the values of the parameters that cause the function to best fit the observed data that you provide. This process is also called curve fitting. Fit thousands of data into your equations in seconds: Curvefitter gives scientists, researchers and engineers the power to find the ideal model for even the most complex data, including equations that might never have been considered. You can build equation set which can include a wide array of linear and nonlinear models for any application. Its state-of-the-art data fitting includes the following capabilities: Any user-defined equations of up to nine parameters and eight variables. Linear equations. Nonlinear exponential, logarithmic and power equations. A 38-digit precision math emulator for properly fitting high order polynomials and rationals. Graphically Review Curve Fit Results: Once your data have been fit, Curvefitter automatically sorts and plots the fitted equations by the statistical criteria of Standard Error. A residual graph as well as parameter output is generated for the selected fitted equation within the Review Curve Fit window. With All This Power, it is Still Easy to Use: Curvefitter takes full advantage of the Windows user interface to simplify every aspect of operation -- from data import to output of results. Import data from many popular file formats including Excel, Lotus and ASCII. Once your data are in the editor, create a custom equation set and start the automatic fitting process with a single mouse click. Curvefitter is highly intuitive, easy-to-use and remarkably simple to learn.
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