anecdotal
(of an account) not necessarily true or reliable, because based on personal accounts rather than facts or research‘Much of the information and government decisions concerning goldenseal are based on anecdotal rather than quantitative information on population status.’
‘I have my own theories on this, but they are based purely on anecdotal evidence.’
‘This paper therefore is based mainly on my own thoughtful experience and informal anecdotal research.’ http://en.oxforddictionaries.com/definition/anecdotal
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