The result analysis of the eigenvectors and principal component time series (PC's) of JJA in the first mode show that the relation or the variance of the eigenvectors is negative over the most region of Thailand but it is positive over at some area of southern region of Thailand, as shown in Figure 3.9(a). Figure 3.9(b) shows the values of standardized (PC’s), which have positive and negative values. It was found that there was the most negative in 1954 found over the most region of Thailand there was high rainfall. On the contrary, there was the most positive in 1994 found over the most region of Thailand there was low rainfall.
The left figure show eigenvector and In the right figure show principal component time series in JJA the first mode show that the relation of the eigenvectors is negative over the most area of Thailand. But it is positive over at the some area of the southern of Thailand. The values of standardized(PC’s), it was found that there was the most negative in 1954 found that It was high rainfall in the most area of Thailand. On the contrary, there was the most positive in 1994 found that, low rainfall in this area.