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How to automate an XLSTAT routine analysis

This tutorial shows how to automate a routine analysis in Excel using the XLSTAT software.

Dataset for automating a routine analysis

The data used is the process measurements of food samples.

We are going to create a Principal component analysis template on one dataset and use it on the second.

Activate the advanced options

Open the first file Automation_1.xls

Go to the menu Options and in the tab Advanced enable the option Show the advanced buttons in the dialog boxes.

Options_EN.PNG
The next step of the automation procedure is to set up your statistical analysis.

Generating the code to automate a routine analysis

Select the XLSTAT / Analyzing data / Principal components analysis command.

PCA_Menu_EN.PNG
In the General tab, set the following:

  • Observations/variables table: Columns B to G

  • Data format: Observations/variables table

  • PCA type: Pearson (n)

  • Variable labels: enabled

  • Observation labels: ticked and select the column A for the sample name

  • Sheet: chosen to display the results in a new sheet

PCA_General_EN.PNG
Go to the next tab Options. For the option Filter factors, choose Maximum number and set the value to six. This way all the components will be calculated.

PCA_Options_EN.PNG
Go to the tab Outputs. Here we want to get a synthetic report so we will only select the following:

  • Eigenvalues,

  • Factor Loadings,

  • Variables/Factors correlations,

  • Factor scores.

PCA_Outputs_EN.PNG
Finally we are going to use all three plots that can be selected in the Charts tab:

  • Correlation charts

  • Observations charts

  • Biplots

PCA_Charts1_EN.PNGPCA_Charts2_EN.PNG
Now we have specified all the setting we will save the code to be reused.

Generate the VBA code to be reused

Click on the grey button at the bottom left of the dialog box: Click this button to generate the VBA code that will allow you to run the dialog box from your code.


Once you have pressed the button a Notepad document will appear containing the VBA code. Save the code under a name that is easy for you to remember, for example in this case we use "VBA-PCA-recipe1".

Results of the analysis

Click on OK to launch the analysis.

Now choose the plot for the axes F1 and F2 by clicking Select, then change the selection to Abscissa F3 and Ordinates F4. Once you have completed this click again on Select and then press Done.


Have a look at the biplot.

Principal Component Analysis software Excel
This process is usually stable so we can expect little variation. You can see that all the samples are centered tidily around the middle of the plot.

Reusing the VBA code

Now open the second file Automation_2.xls Press Alt+F11 together in order to launch the Visual Basic Application. Then select Sheet1 in the folder VBAProject(Automation_2.xls) and finally right click and opt for the action Insert / Module.

automate a routine analysis
The next step is to copy and paste the code contained in the Notepad file into this module.

automation
At this step you can add more codes to enable the programme to perform other actions. Go to the menu Run / Run Macro located in the menu bar.

automation of analysis
Then you need to run first the macro called "RunMeOnce". This will make a link between the file and the XLSTAT project where the code is stored. Select it in the list and click on Run.

VBA automation software
When this has been completed, run the second macro called "MySub". Return to the menu Run / Run Macro and this time select the macro "MySub" before pressing the button Run. This will in turn execute the code in question and you now have a sheet "PCA" containing the results. Now if we look at the biplot of the second analysis we notice that this time one of the samples seems to be further away thant the other samples. Sample 13 may be an outlier.

Principal Component Analysis biplot

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