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基于角度资料(如脑电阻的上升角、主峰角,心电图中的QRS心电轴的角度等)昼时性资料(如住院病死发生时间分布等)、季节性资料(如疾病发生在全年12个月中的分布)、方向性资料(如与环境有关的风向等)都具有周期性变动的特点,不宜采用通常的统计方法进行描述和分析。例如3个产妇生产的时间为:1.32、23.5、0.44都邻近午夜,若用算术平均数计算,(?)=(1.31+23.59+0.44)/3=8.45,是上午时刻,显然是不合逻辑的。
Based on angle data (such as the rising angle of the brain resistance, the main peak angle, the angle of the QRS axis in the electrocardiogram, etc.), the temporal data (such as the distribution of time in hospital deaths, etc.), seasonal data (such as the disease occurred in the whole year 12 The distribution in the months), directional data (such as the wind direction related to the environment, etc.) all have the characteristics of periodic changes, and it is not appropriate to use the usual statistical methods for description and analysis. For example, the time for three maternal productions is: 1.32, 23.5, and 0.44 are all close to midnight. If you use the arithmetic mean, (?)=(1.31+23.59+0.44)/3=8.45, which is the morning time, obviously illogical .