SemanticMetadata.net » stats http://www.semanticmetadata.net Wed, 11 Jan 2012 16:35:54 +0000 en hourly 1 http://wordpress.org/?v=3.3.1 Less than 20% of Flickr images tagged … http://www.semanticmetadata.net/2008/07/03/less-than-20-of-flickr-images-tagged/ http://www.semanticmetadata.net/2008/07/03/less-than-20-of-flickr-images-tagged/#comments Thu, 03 Jul 2008 12:42:59 +0000 Mathias Lux http://www.semanticmetadata.net/2008/07/03/less-than-20-of-flickr-images-tagged/ While writing a scientific paper on tag recommendation I checked – just out of curiosity – the share of images tagged by their uploaders on Flickr. I found out that 4 out of five images are untagged and that less than 15% of images have 2 or more tags.

My method and detailed results: In general one would need a random sample for such an investigation, but a truly random sample is hard to obtain without access to the data base. Therefore I just grabbed 20,004 images from the RSS feed for recent uploads and counted the number of tagged images. Easy enough I also computed the confidence interval:

  • In my sample 3,650 images were tagged with at least one tag, that makes p1=18.25%
    • With alpha=0.99 p1 is in [16.84, 19.66].
    • That leaves more than 4 out of 5 images untagged.
  • Also in my sample 2,628 images were tagged with at least two tags, that makes p2=13,14%
    • With alpha=0.99 p2 is in [11.9, 14.37].
    • That means that less than 15% of the images images have more than one tag.
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