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一、基本思想方差分析是时间序列分析方法之一,它根据时间序列的自身变化规律,寻找其变化周期。它的基本思想是: 假设有一个具严格的三年周期的时间序列:3,2,1,3,2,1,3,2,1,将它按三年一列,顺序排列如下表:显而易见,i 行内差异为0,而 i 行间差异很大.我们不妨把 i 行内的差异看做组内差异,i 行间的差异看做组间差异。农作物病虫发生程度的时间序列不会像上例那样具有严格周期变化,一般为准周期变化。如大发生与小发生经过一定时
First, the basic idea of variance analysis is one of the methods of time series analysis, according to its own time series of changes, looking for the cycle of change. Its basic idea is: Suppose there is a strict three-year cycle time series: 3,2,1,3,2,1,3,2,1, according to its three-year column, the order of the following table: Obviously , the difference between i rows is 0, and the difference between i rows is very large.We may consider the differences within i rows as intra-group differences, and the differences between i rows as the differences between groups. The time series of crop pests does not have a strictly periodic change as in the previous example, and is generally a quasi-periodic change. Such as the occurrence of large and small after a certain time