* The comparison relies on raw data from a self-selected sample [http://en.wikipedia.org/wiki/Category:Wikipedians_by_political_ideology].
* The comparison relies on raw data from a self-selected sample [http://en.wikipedia.org/wiki/Category:Wikipedians_by_political_ideology].
* It compares 2 answers of a poll with 3 possible answers, to 2 of 32 user categories.
* It compares 2 answers of a poll with 3 possible answers, to 2 of 32 user categories.
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* It compares the outcome of a poll in which respondent can only choose one option, with one users can choose as many options as they like.
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* It compares the outcome of a poll in which respondent can only choose one option, with one a self-identifcation project, in which users can choose as many options as they like.