I didn't critique someone else's approach to data analysis. These "someone elses" are swearing by a pattern based upon 2 iterations.
Sigh. No, they're not.
Apple has repeatedly demonstrated that they generally do NOT follow patterns...
On the contrary, they tend to follow patterns quite regularly. Occasionally, those patterns get adjusted.
...We just saw that with no new iPhone at WWDC after a fairly regular, apparent link to launching new iPhones there. Now, they make one change, and this crowd has pretty much adopted a Fall to Fall "pattern" for iPhones...
And this actually fits with the pattern, if you've been paying attention to what the pattern is and accept that it undergoes adjustment every now and then. It is also possible that last year represented a one-time shift, and this year it'll be back to the WWDC. That is regarded as less likely, as that would mean a dramatically shorter development cycle between the iPhone 4S and the iPhone 5.
I am not predicting when it/they will launch. I'm suggesting there's no pattern.
And this is precisely what suggests that you don't understand data analysis and pattern recognition.
There's a buying guide on this site. Note how it doesn't predict specific dates or even a specific month for product launches.
Of course it doesn't. They don't have access to Apple's production schedule. They don't know all of the factors that are being considered as to when a product will be released. So, all they can do is make predictions based on history.
Based on your post, I went to it and looked at iOS devices in search of a pattern vs. outliers. It shows iPhones as 2/08, 7/08, 6/09, 6/10, and 10/11. What's the pattern there?
You might want to try a better source for your data.
Please take your superior

approach to data analysis and show me the pattern and then please use it to correctly call when an iPad 3 will be launched and whether an iPad 4 will launch this year or next. We all want to know for certain.
Consider the following:
iPhone 6/2007
iPhone 3G 6/2008
iPhone 3Gs 6/2009
iPhone 4 6/2010
iPhone 4s 10/2011
iPod Touch 1st Gen 9/2007
iPod Touch 2nd Gen 9/2008
iPod Touch 3rd Gen 9/2009
iPod Touch 4th Gen 9/2010
iPod Touch 4th Gen update 9/2011
iPad 1 3/2010
iPad 2 3/2011
So, as I would hope you can see, the iOS devices have a solid track record of annual releases. The only violation of this, at this point, since the release of the first iPhone, has been the four month delay of the iPhone 4s. (Note that I'm neglecting the CDMA version of the iPhone 4, as it wasn't a product update, simply an alternate version of an existing product released mid-cycle. However, it is easy to argue that the CDMA iPhone 4 played into the choice to delay the iPhone 4s...)
Now, you can roll your eyes at me all you want. I have a master's degree in physics, I've worked in graduate research labs, I've done research level data analysis. Call my attitude superior, if it makes you feel better, but I do have a pretty good idea of what I'm talking about...