DataFitX is a COM component (in-process ActiveX DLL)
which allows you to add a powerful nonlinear
regression (curve fitting) engine to your software
with just a few simple lines of code. Since DataFitX
is developed using COM technology, it can be used in
any software or development environment that supports
COM, including Microsoft Visual Basic, Microsoft
Visual C++, Delphi and VBA (Microsoft Excel, Microsoft
Access or any VBA enabled client). A DataCollection
object provides methods and procedures for importing
and gathering data, as well as providing statistical
summaries for the data. The NonlinearRegression and
MultipleNonlinearRegression objects provide methods
and procedures for defining regression models with up
to 100 fitting parameters and performing nonlinear
regression on data containing up to 20 independent
variables. These objects provide properties and
methods that return results for the fitting
parameters, as well as detailed statistical summaries
of the regression results. Arrays of predicted values
and residuals are automatically generated, but you can
also predict values on a point by point basis (Y at a
value of X), or create arrays of predicted values
based on data arrays you supply. These objects also
include methods to perform derivative and multiple
root calculations (X values at a specified value of
Y). There are more than 400 pre-defined models, but
you can easily define your own by passing a string
representation of a model to one of the model creation
methods. You can also create event-based regression
models, which allows the client code to supply the
function evaluations and optionally the derivative
calculations through raised events. In total, there
are six objects with 173 methods, procedures and
events. You can process the regression results in the
client code, or export regression results in DataFit
native file format. A DataFitX developer license
includes royalty free run-time distribution.

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