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In general, an opinion is a judgment, viewpoint, or statement about matters commonly considered to be subjective. What distinguishes fact from opinion is that facts are verifiable, i.e. can be objectively proven to have occurred. An example is: "United States of America was involved in the Vietnam War" versus "United States of America was right to get involved in the Vietnam War". An opinion may be supported by facts, in which case it becomes an argument, although people may draw opposing opinions from the same set of facts. Opinions rarely change without new arguments being presented. It can be reasoned that one opinion is better supported by the facts than another by analyzing the supporting arguments. In casual use, the term ''opinion'' may be the result of a person's perspective, understanding, particular feelings, beliefs, and desires. It may refer to unsubstantiated information, in contrast to knowledge and fact. Collective or professional opinions are defined as meeting a higher standard to substantiate the opinion. (see below) ==Epistemology== In economics, other social sciences and philosophy, analysis of social phenomena based on one's own opinion(s) is referred to as normative analysis (what ''ought'' to be), as opposed to positive analysis, which is based on scientific observation (what materially ''is'' or is empirically demonstrable). Historically, the distinction of demonstrated knowledge and opinion was articulated by Ancient Greek philosophers. Today, Plato's analogy of the divided line is a well-known illustration of the distinction between knowledge and opinion, or knowledge and belief, in customary terminology of contemporary philosophy. Opinions can be persuasive, but only the assertions they are based on can be said to be true or false. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Opinion」の詳細全文を読む スポンサード リンク
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