Gavagai’s Fredrik Olsson is in Istanbul today presenting a paper on “Technical Requirements For Knowledge Representation For Reputation Mining On A Realistic Scale” at the LREC 2012 Workshop on Language Engineering for Online Reputation Management.
In this post, we confirm that Loreen is well placed to win the popular vote in the Eurovision Song Contest final 2012.
- We use Twitter to measure the popularity of the contestants in ESC 2012.
- When scaling with Twitter penetration, Sweden gets the highest relative popularity score.
- This is in line with current betting odds, which unanimously rank Sweden as the most likely winner.
- Gavagai has previously made accurate forecasts of the distribution of the popular vote in the national ESC final.
We have previously shown in this blog that Ethersource monitoring of on-line sentiment can predict the popular vote in certain high-profile media events, such as the national Eurovision Song Contest. In this post, we report on some observations on using Ethersource to measure the popularity of the contestants in the international Eurovision Song Contest, based on analysis of expressions of popularity on Twitter. The following image shows the relative popularity scores of the participating countries.
It should be obvious to anyone following the pre-contest speculations about who will win the ESC 2012 that the proportions of popularity in this image do not correlate with current betting odds for the ESC final (the current odds can be found at any betting site). The image shows Ireland and the UK as the most popular contributions in the ESC final (they are ranked 11th and 5th in the current betting odds). One reason for this discrepancy can be that popularity and betting odds do not refer to the same type of measurement; popularity refers to population-wide opinion, while betting odds are estimates of who will win the actual contest (which is determined both by popular and jury votes). Another reason for this discrepancy is the issues identified in commentaries of other recent attempts to predict election votes based on sentiment analysis of the Tweet stream:
- Twitter users (and users of other social media) do not constitute a perfect sample of the population, which means that measurements based on Twitter may not be representative for the population as a whole.
- Twitter is a perfect medium for marketers and campaigns, which makes the analysis sensitive to ad-bots and automated Twitter campaigns.
These concerns are of course valid also for the present scenario. However, even more important when comparing measurements based on Twitter analysis across different countries are the following issues:
- There is a huge difference in population size between the European countries: Russia has a European population of more than 100 million, while Iceland has a population of a mere 300 000 inhabitants.
- The Twitter penetration (i.e. proportion of the population that use Twitter) is very different for different countries. In the present scenario, where we measure expressions of popularity on Twitter, it means that some countries may get high popularity scores merely because a comparatively large proportion of the population in that country uses Twitter (people tend to promote their own country’s entry in the ESC).
It is somewhat difficult to find recent and reliable estimates of the Twitter penetration per country, but not so recent studies show that the Netherlands, Turkey, UK, and Ireland top the list for Twitter penetration in Europe. Perhaps this explains the results we see in the image above? Scaling the popularity scores for each country by the estimated number of Twitter users in that country produces the following image:
When scaling with Twitter penetration, Sweden gets the highest relative popularity score. This is in line with current betting odds, which unanimously rank Sweden as the most likely winner. However, the other countries that receive high normalized popularity scores do not correlate with odds rankings: Greece has the second highest popularity score (ranked 14th place in the odds rankings), followed by Denmark (ranked 8th place), Ireland (11th), and Iceland (7th). These discrepancies may be due to the issues with non-representativeness and Twitter penetration discussed above. We may also add the following issues:
- The activity level of the Twitter population in some countries may not correspond with the Twitter penetration; Twitter users may be more active in some countries than others.
- The interest for the ESC may be higher in certain countries than others, thus leading to more Tweets about the contestants from that country.
We conclude this post with the observation that Loreen seems to be the likely winner of the popular vote in the ESC final 2012. We also conclude that attempting to model population-wide opinions based on Twitter analysis is a non-trivial task that requires more than merely counting word frequencies.