Curve Expert Pro

[Reda]

CurveExpertBasic was designed to be easy-to-use but powerful, so that all users can obtain a model for their data quickly and easily. XY data can be modeled using a toolbox of linear regression models or nonlinear regression models.

Over 60 models are built-in, but custom regression models may also be defined by the user. Full-featured graphing capability allows thorough examination of the curve fit. The process of finding the best fit can be automated by letting CurveExpert Basic compare your data to each model to choose the best curve.

CurveExpert Basic is a subset of the functionality contained in CurveExpert Professional and is intended for more casual/infrequent users. The list below is a specific list of differences between the two; the items are listed as features that CurveExpert Pro supports, but CurveExpert Basic does not.

CurveExpert Professional is a cross-platform solution for curve fitting and data analysis. Data can be modelled using a toolbox of linear regression models, nonlinear regression models, smoothing methods, or various kinds of splines. Over 90 models are built-in, but custom regression models may also be defined by the user. Full-featured publication-quality graphing capability allows thorough examination of the curve fit. The process of finding the best fit can be automated by letting CurveExpert compare your data to each model to choose the best curve. The software is designed with the purpose of generating high quality results and output while saving your time in the process.

I'm really impressed by the enhanced options of CurveExpert Professional, streamlined to give the professional the most quick answer to detect dependencies within its data, express them via formulas, and even calculate with them immediately. Definitively there isn't anything better on the market!

I find that Curve Expert Professional is more versatile and much easier to use than CurveExpert Basic, for example, when entering the initial guesses for the parameters. The graphics of CurveExpert Professional are far superior, as well.

As an Embedded Software Engineer who is involved with the control of medical devices, the ability to quickly determine the underlying relationship of easily-gathered empirical data is quite an advantage. CurveExpert has proven to be an invaluable tool when used in this respect and has saved countless hours of unnecessary effort. The information gained through CurveExpert is easily applied to process analysis, simulation and control purposes. CurveExpert's publication grade data plots make presentation and development documentation quite simple. The software is a real joy to use and the affordable price means this software has been created to be utilized by a wide range of end users from student to professional.

I use CurveExpert Professional infrequently but it is nice having that extra tool in your bag when you need it; especially when CurveExpert works easily, accurately and as automatically or manually as you choose. My application is sensors attached to complex SCADA systems where precision calibration of measurement data is required. A vendor will provide calibration data and a curve fit which rarely match. I use CurveExpert to resolve the disconnects. I do not use the majority of CurveExpert's capability but for the past 15 years CurveExpert has completely solved my sensor calibration problems. And the customer service CurveExpert provides is second to none.

We use CurveExpert [Basic] extensively in our research on probability distributions of forest fires. As an exploratory and analytical tool it is unparalleled in its flexibility, ease of use, and accuracy.

I have used CurveExpert [Basic] to fit some Temperature vs Time dehydration food data to give me a grounding for the basic fitting function to be used. One can then modify the basic fitting function accordingly to give meaning to the fit parameters calculated by curve expert. I especially find useful the automatic fit function.

I have used CurveExpert Basic for years and it is one of the most indispensible applications in my arsenal. CurveFinder is one of the most useful features in CurveExpert Basic and I will likely lean on it heavily in CurveExpert Professional. Does most of the hard work for you in coming up with the "best" curve fit.

I have just started to explore CurveExpert Professional and as I expected I am definitely going to upgrade. The new graph interface is very nice. A lot to work with there to get really high quality plots. The ability to use a subset of TeX is awesome. I use MathType from Design Science in Office documents so having TeX in CurveExpert Professional plots is a real plus for documentation.

In project design engineering, and other engineering activities as well, the evaluation of the physical phenomenon is greatly improved supported in the program, which allows the visualization of the behavior of the variables involved.

Once any results have been calculated,whether they are curve fits (regressions), interpolations, smoothings, or functions,they appear in the result pane ranked in order of their score (the result pane normallyis shown in the upper left part of the CurveExpert Professional application, see User Interface). The score reflects howclosely the model adheres to the underlying data.Note that functions (as opposed to models) do nothave a score, as they are not associated with the data directly in any way.

In the results pane, the results can also be sorted by any of the items displayed in the column header(name, kind, family, score, correlation coefficient, coefficient of determination, or standard error) simplyby clicking the appropriate column header. Note that you can right-click on the column header in order tocustomize what is displayed in the results list; by default, the name, kind, and score is displayed.

When selecting results, you can simply click on the result (which selects it), or use multiple selection byholding down SHIFT or CTRL when clicking on results. This allows you to apply an operation to batches ofresults at once.

A yellow color coding indicates that the result should only be used with caution. It indicates that the calculationsucceeded, but with reservations. The most common cause for this is a nonlinear regression calculation thatdid not converge before the maximum number of iterations (configurable via Edit->Preferences->Regression) was reached.Again, the score will indicate how well the model adheres to the data.

If a result is presented in yellow, it is highly recommended to examine the residual and parameter histories tosee if the parameters would have changed further if the max number of iterations is higher. Double click on theresult in the results pane, and select the Convergence tab in the resulting dialog. Also examine the PHisttab.

Every result is badged with either a green checkmark or a yellow exclamation point. The intention here is toinform the user when a result becomes invalid due to a change in the underlying dataset. For example, ifa nonlinear regression is calculated, and then the dataset is scaled (using, say, the tools in the Data menu),that nonlinear regression becomes invalid, and an attention badge is placed on that result in the results paneto signify this.

Pointing at a result will show its preview in the preview pane, usually at the bottom left of your application. Also, thestandard error and correlation coefficient, if applicable, will display in the status bar at the bottom of the applicationwindow.

in the application preferences), and add the selected results to that plot.* right click a result in the Results pane, and select Send to Current Plot. This will plot the selected results directly on the active plot.* drag and drop the result from the Results pane into a graph, and that will add the result to the graph.

To send multiple results to a graph at once, you can multiple select items in the result pane with either the shift or control key. Thendrag and drop, or right-click and select Send to New Plot or Send to Current Plot as normal.

If you decide that a result is no longer needed, select it, right click, and pick Remove. This action is not undoable, but certainly theresult can be calculated again by simply picking it from the Calculate menu.

Like placing results on a graph, you can remove multiple results at once by shift-clicking or control-clicking to select the results that youwant to remove.If the results are shown in any graph, they are removed from the graph as well.

If the selected result is a regression, the entry Copy Parameters will also appear. Select this to copy only the parameter name/value pairs tothe clipboard, separated by the delimiter selected in the application preferences.

In the result details window, you can examine a particular result much more closely. The left pane shows the name of the result, its family, andan equation for the result, if applicable. For a model, the fitted parameters are also shown on the left. To copy result details to the clipboardin text format, simply click the Copy button.

The notebook on the right contains several items of interest, most notable of which is the result graph (in which a graph is shown with just the dataand the single result), and the table tool, in which a data table can be generated with this result. The following sections describe each sectionof the notebook.

The result graph simply shows the data and the current result, so that you can visualize the result without the (possible) clutter of having otherresults on the same plot. All of the graphing capabilities (see Graphing) are also available here, including zooming, panning, changing thegraph properties, saving the plot to file or clipboard, and printing.

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