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differ from sign as it return 0 when x is NA
sign1(x)
1 if x > 0 -1 if x < 0 0 if x = 0 or x = NA
any number
Aldo Marchetto
Hirsch R.M. & Slack J.R. 1984. A nonparametric test for seasonal data with serial dependance. Water Resources Research, 20: 727-732
rkt
a<-1 sign1(a) a<-NA sign1(a)
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