Dictionary:Systematic error

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{{#category_index:S|systematic error}} Error not attributable to chance alone. Systematic errors generally do not average out merely by including more measurements. They may be caused by bias produced by the instruments (for example, incorrect scale factor or incorrect zero), by the observer or measuring procedures (for example, not selecting representative samples or altering samples before the measurements), or by the action of factors or physical laws that are not properly allowed for or understood. Most geophysical noise is systematic.