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1误差1.1随机误差来源于分析过程中一系列微小的随机波动,主要有仪器示值的波动,读数误差;试验室环境中气温、气流、光线和湿度的变化,检验者的取样和视觉误差等。特点:(1)对称性(绝对值相等的正误差于负误差相等);(2)单峰性(绝对值小的误差比绝对值大的误差次数要多);(3)有界性(一定测量条件误差绝对值不超过一定范围);(4)抵偿性(测量次数增加,算术平均值趋向0)。
1 error 1.1 random error comes from a series of small random fluctuations in the analysis process, there are major fluctuations in instrument indication, reading error; laboratory environment temperature, airflow, light and humidity changes, the test samplers and visual errors . Features: (1) Symmetry (positive errors equal in absolute value equal to negative errors); (2) unimodality (smaller absolute errors have more errors than absolute ones); (3) The absolute value of certain measurement conditions does not exceed a certain range); (4) compensability (measurement times increase, the arithmetic mean tends to 0).