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Woodlane

Statistical Process Control (SPC) Tool for Broadband?

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Does anyone know of a site or utility that can calculate a cpk or similar metric from download and upload speed measurements? A lot of us us are concerned about the variability of our speeds, but I have not seen a tool that will actually quantify it. Maybe Testmy.net could add this as a feature from data that is being collected combined with the speed that the member is paying for. In the meantine I am looking.

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Just presenting a mean and a std dev of a measurement would be an indicator that a user could gauge against an ISP "guaranteed" lower speed limit. This would tell you the variation (the user could pick a sigma level). Calculating Cpk would require the user to enter the target speed min they guarantee, and that seems to be beyond the scope of this site.

Based on my experience looking at measurements here and comparing to my ISP's 10 Mbps min "guarantee", I'd say my Cpk would always be something like 1/1,000,000 haha, and everyone elses would probably not be much better. I've only seen my TWC min speed guarantee exceeded a couple of times in hundreds of measurements.

It would be interesting if there was a "see details" button that would pull up the mean, std dev, number of complete dropouts, and number of samples used.

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At the same time , having a guaranteed speed is rather fictitious and a bit false leading.

Since no ISP can come close to guaranteeing any speed , outside of their network, no matter how they are peered .

The numbers of any equation at that point of detail would be null and simply a mathematical probability, much less then the expected results of certainty.

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Does anyone know of a site or utility that can calculate a cpk or similar metric from download and upload speed measurements? A lot of us us are concerned about the variability of our speeds, but I have not seen a tool that will actually quantify it. Maybe Testmy.net could add this as a feature from data that is being collected combined with the speed that the member is paying for. In the meantine I am looking.

Sure, I could add this for you. I have new per user database information I'm working on... this will most of your settings previously held by cookies and will follow you. On your new speed test preferences page I'll add a section for promised speed and that will be calculated with your results.

... should be too long from now. Look for this as well as other new settings soon. ;) -- good idea :-D

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CA3LE - whatever you add in the way of statistics to help in troubleshooting an issue would be helpful. But like mudman is saying

At the same time , having a guaranteed speed is rather fictitious and a bit false leading.

Since no ISP can come close to guaranteeing any speed , outside of their network, no matter how they are peered .

The numbers of any equation at that point of detail would be null and simply a mathematical probability, much less then the expected results of certainty.

Just showing mean, std dev, number of complete dropouts, and number of samples used for a test would be helpful in analyzing signal stability when troubleshooting a problem.

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CA3LE - whatever you add in the way of statistics to help in troubleshooting an issue would be helpful. But like mudman is saying

Just showing mean, std dev, number of complete dropouts, and number of samples used for a test would be helpful in analyzing signal stability when troubleshooting a problem.

Agreed' , sometimes I think much too deep , which leads me away from the task or request. It's an issue I'm dealing with :lol:

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