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Monday, May 11, 2009

Online Cusum Chart with YOUR Data! The CUSUM Calculator Chart

Copy a single column of numbers (max 90 rows) from Excel and paste in the form below. (Numbers should be separated by a tab- simple copy and paste should work without doing anything fancy.) Click Submit. Then after about 5 minutes refresh this page and hopefully your data as well as the CUSUM should be visible in the chart below.
*(If it doesn't happen in 10 minutes, then there is something wrong; my apologies if this is the case. It could be the format of your data or something going wrong with my code.) But hopefully it will work!

This is the output result:

Friday, May 8, 2009

Useful Excel Charting Tip - Useful Script

So you have lot of data variables in a spreadsheet, and would like to eyeball it in a chart and get a quick idea of relationships between variables etc, but it is too cluttered because of so many series if you tried to put them all one on chart. Wouldn't it be great if there was a quick way to toggle individual series "on" and "off" while looking at your chart?

The usual method is to limit the number of series, delete series or change line properties manually to make them disappear one by one, but thats a lot of work. Besides, to undo the change is just as much work.

Here's a script I put together that lets you toggle series on and off just by selecting and then double clicking the series legend text!

It works by toggling each line series linestyle property between a solid line and no-line, giving the illusion of switching off the line series. It won't remove markers but you could easily adapt it to do that. One limitation- it only works on a chart thats on its own sheet (i.e. not embedded inside a worksheet.)


1. Create your Line or XY chart as you desire, but located as its own sheet. (NB not embedded in another worksheet). Make sure you have a legend (i.e. list of series names displayed), and this works best with line only chart types, although you could adapt it for markers as well.
2. On the menu, Click Tools -> Macro -> Visual Basic Editor
3. When visual basic edit loads, explore and find VBAproject ("Yourfile name")
4. Expand the Microsoft Excel Objects items and find the name of your chart (usually "Chart1")
5. Doubleclick on the name of your chart- it will put the cursor in the code window.
6. Copy and paste the following code into the code window:

Private Sub Chart_BeforeDoubleClick(ByVal ElementID As Long, ByVal Arg1 As Long, ByVal Arg2 As Long, Cancel As Boolean)

If ElementID = xlLegendEntry Then
If SeriesCollection(Arg1).Border.LineStyle = xlLineStyleNone Then
SeriesCollection(Arg1).Border.LineStyle = xlSolid
SeriesCollection(Arg1).Border.LineStyle = xlLineStyleNone
End If
End If
Cancel = True
End Sub

7. Go to the menu File -> Close and Return to Excel
8. Voila... it should work. To test click on one of the legend texts in the legend box, then double click individual legends to toggle them off and on.
9. Remember to save.
10. Repeat for any additional charts you wish to make.

New to Excel VBA? This might help:

Saturday, October 25, 2008

Free Online Stats Book (or order the print version thru Amazon)

StatSoft make the very powerful Statistica stats software package. They also make a free online stats book available here. This is quite a useful reference to understanding statistics and advanced analysis methods.

Alternatively you can order the print version, which Amazon retails for around $80.


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