I need propability plots to show a normal distribution or a weibull distribution and so on.
Greetings Heinz
Propability plots
Hi, Heinz.
Using the latest TeeChart version which supports custom axis labels (text and position for individual labels) implementing any nonlinear plot should be easy. All you need is transformation for values and labels.
I've implemented it for normal, Weibull and QQ plots. I'll prepare an article about this shortly and post it here.
Using the latest TeeChart version which supports custom axis labels (text and position for individual labels) implementing any nonlinear plot should be easy. All you need is transformation for values and labels.
I've implemented it for normal, Weibull and QQ plots. I'll prepare an article about this shortly and post it here.
qq plots etc
When is shortly (mentioned in 2003 november ) ?
Hi.
Sorry about (long) delay. I've implemented some of the probabilities plots (among other addditional statistical charts) for another statistical library I'm working on. Some images are available at http://www.dewresearch.com/StatsSeriesGallery.html. In case you're interested I can send you full C# sources (for TeeChart .NET).
Sorry about (long) delay. I've implemented some of the probabilities plots (among other addditional statistical charts) for another statistical library I'm working on. Some images are available at http://www.dewresearch.com/StatsSeriesGallery.html. In case you're interested I can send you full C# sources (for TeeChart .NET).
Marjan Slatinek,
http://www.steema.com
http://www.steema.com
probability plots with teechart
I have now implemented probability plots in EpiData using a standard point series of teechart. The sequence is:
http://www.epidata.dk  general download page later or currently: http://www.epidata.dk/testing.php
example:
For a test users can download an application at:1. create a series with cumulative percentages
.. xvalues cumpercentage
2. convert to probabilities, e.g. see
.. xvalues cumprob
Bland M: Introduction to Medical Statistics. Oxford, 2nd ed. p 112.
3. find an inverse normal function for the probabilites
yvalue = inverse normal (cumprob)
(search internet for "normal probability .....source code", you will get several hits., e.g. "normal probability pascal source"
4. create a standard TChart with a pointseries and do a addxy(xvalues yvalue) and you have the normal probability plot
http://www.epidata.dk  general download page later or currently: http://www.epidata.dk/testing.php
example:
Marjan,Marjan wrote:Hi.
Sorry about (long) delay. I've implemented some of the probabilities plots (among other addditional statistical charts) for another statistical library I'm working on. Some images are available at http://www.dewresearch.com/StatsSeriesGallery.html. In case you're interested I can send you full C# sources (for TeeChart .NET).
I would be very interested in the QQplot code. Would you be able to send me a copy?
Cheers
Francis

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Hi Francis,
Marjan told me that he uses some specialized code to calculate each point QQ value so it's a bit difficult to split it into a simple unit. But basically he's using the same approach other customer reported (epidata). He's doing normal probability plot, but if you omit the normalcdf calculation on y values, you'll end up with QQ chart.
Marjan told me that he uses some specialized code to calculate each point QQ value so it's a bit difficult to split it into a simple unit. But basically he's using the same approach other customer reported (epidata). He's doing normal probability plot, but if you omit the normalcdf calculation on y values, you'll end up with QQ chart.
Best Regards,
Narcís Calvet / Development & Support Steema Software Avinguda Montilivi 33, 17003 Girona, Catalonia Tel: 34 972 218 797 http://www.steema.com 
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