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Fit Data

iGrafx uses supported, external statistics applications such as JMP or MINITAB to do data fitting. You can easily determine the expression you need to put into your process model using the Fit Data feature.

Store measured data in your statistical application, then use Fit Data to find a supported random distribution that generates data similar to the data you already have. You can make inferences from graphs about which distribution fits best, and study the goodness-of-fit measure from the statistics application that is displayed in the Distributions dialog box.

1. On the Six Sigma menu, choose Fit Data.

2. In the Choose Data dialog box, select a worksheet in the Open Worksheets list.

3. In the Available Columns list, select a column of data and click OK.
   
   Do not choose a column containing non-numeric data or having fewer than six data points. Columns containing negative data cannot be used in the Weibull and Exponential distributions.

4. In the Distributions dialog box, select the Plot check boxes for the distributions you want to show on the graph.

The data is plotted in the lower window of the dialog box.

5. Click the distribution in the upper table that best fits your data. The expression appears under the Copy button.

6. Click the Copy button and paste the expression into the desired expression for an activity, such as the Duration field on the Task page in the Properties dialog box.

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