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Significant Tags adds two possible arguments to WordPress' tagcloud function (wp_tag_cloud) that give you more control over what tags should be shown. In particular, this plugin will cut the most rarely and/or the most often occurring tags, the specific numbers depending on the parameter chosen.

When calling wp_tag_cloud, add key drop_bottom (and/or drop_top) with one of the following values:

• 'N' with N an integer. Will drop the tags with the N smallest (largest) post counts.
• 'Nc' with N an integer. Will drop tags with less (more) than N posts.
• 'N%' with N an integer. Will drop tags with the N percent smallest (largest) post counts.
• 'Xs' with X a float. Will drop tags with post count more than X times standard deviation below (above) the average of all counts.

Please direct your support questions to the forums and report bugs or ideas here.