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Prediction
A prediction (Latin ''præ-'', "before," and ''dicere'', "to say"), or forecast, is a statement about the way things will happen in the future. It is often, but not always, based upon experience or knowledge. While there is much overlap between ''prediction'' and ''forecast'', a ''prediction'' may be a statement that some outcome is expected, while a ''forecast'' is more specific, and may cover a range of possible outcomes. A "prediction" may be contrasted with a "projection", which is explicitly dependent on stated assumptions.
Although guaranteed accurate information about the future is in many cases impossible, prediction can be useful to assist in making plans about possible developments; Howard H. Stevenson writes that prediction in business "... is at least two things: Important and hard."〔Stevenson, Howard, ed. ''Do lunch or be lunch''. Boston: Harvard Business School Press, 1998〕
==Informal prediction==
Outside the rigorous context of science, the term "prediction" is often used to refer to an informed guess or opinion. A prediction of this kind might be inductively valid if the predictor is a knowledgeable person in the field and is employing sound reasoning and accurate data. Large corporations invest heavily in this kind of activity to help focus attention on possible events, risks and business opportunities, using futurists. Such work brings together all available past and current data, as a basis to develop reasonable expectations about the future.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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