Got it slightly wrong.

I was just working on some aspects of the PowerPR index – or whatever I’m going to call it cos I don’t like that name any longer – and suddenly had a slightly uncomfortable feeling that my ‘Which metric is the most important’ may not have been strictly correct.

I just added up the figures I posted, and the average for Technorati Authority is not, as I claimed, 9.4. If you simply copy those figures I posted, paste them into a spreadsheet and average out the differences, it comes to 4.81.

It looks like I got everything right up until the very last equation for averaging the differences. This is akin to Deep Thought getting to the very last calculation when figuring out the meaning of life, and screwing up ‘what do you get if you multiply six by nine’ to get 42.

I can only apologise for this. I got a lot of hits on that post and was quite pleased with the analysis.

So the actual variances pan out like this (believe me, I’ve checked and double- and triple-checked these, and then some):

  • Technorati Authority=4.81
  • Technorati Rank=9.51
  • Technorati Inboundlinks=5.37
  • Yahoo Inlinks=10.66
  • Google Hits=9.93
  • Google Blog Hits=8.52
  • Google Blog Hits over a month=9.88
  • Blogpulse Hits=8.91
  • Blogpulse Hits over 180 days=6.85
  • Looking at these figures, they tell me that Technorati Authority is the best predictor of performance as it is the lowest figure. That is, a blog would only change places, on average, around 5 times if I ranked purely according to Technorati Authority. And now, I see that Yahoo Inlinks, far from being the most accurate predictor as originally stated, is in fact the least. Ouch. 

    If none of this means anything to you then I suggest you take a look at the original posting, complete with contrite edits. I felt I needed to clarify my position here because that post actually got the most hits of any post I’ve ever made. Which means I’ve now made a fool of myself in front of a record number of people. At least I’m an honest fool.

    In fact, I’m so honest that if anyone would like to see the calculations I used for these figures then please just ask.

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    5 thoughts on “Got it slightly wrong.

    1. Pingback: Over the past six PR Friendly Indexes: mostly declining « Brendan Cooper, your Friendly Digital Social Media PR, ummm, Thingy

    2. Pingback: The PR Friendly Index for March 2009 « Brendan Cooper, your friendly neighbourhood social media strategist

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