the sequential
data values, n is the length of the data set, and sgn^ xij|xik is
equal to 1, 0, -1 if xij|xik is greater than, equal to, or less than
zero, respectively. Si is normally distributed and the mean
and variation of S are defined as follows, Where ni is the
number of sample and ti is the number of pairs having the
same concentration. The null hypothesis H0 is accepted if . In
this study, each season is defined as monthly units.
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