mkTrend_r {rtrend} | R Documentation |
Modified Mann Kendall
Description
If valid observations <= 5, NA will be returned.
Usage
mkTrend_r(y, ci = 0.95, IsPlot = FALSE)
mkTrend(y, x = seq_along(y), ci = 0.95, IsPlot = FALSE)
Arguments
y |
numeric vector |
ci |
critical value of autocorrelation |
IsPlot |
boolean |
x |
(optional) numeric vector |
Details
mkTrend is 4-fold faster with .lm.fit
.
Value
-
Z0
: The original (non corrected) Mann-Kendall test Z statistic. -
pval0
: The original (non corrected) Mann-Kendall test p-value -
Z
: The new Z statistic after applying the correction -
pval
: Corrected p-value after accounting for serial autocorrelationN/n*s
Value of the correction factor, representing the quotient of the number of samples N divided by the effective sample sizen*s
-
slp
: Sen slope, The slope of the (linear) trend according to Sen test
Note
slp is significant, if pval < alpha.
Author(s)
Dongdong Kong
References
Hipel, K.W. and McLeod, A.I. (1994), Time Series Modelling of Water Resources and Environmental Systems. New York: Elsevier Science.
Libiseller, C. and Grimvall, A., (2002), Performance of partial Mann-Kendall tests for trend detection in the presence of covariates. Environmetrics 13, 71–84, doi:10.1002/env.507.
See Also
fume::mktrend
and trend::mk.test
Examples
x <- c(4.81, 4.17, 4.41, 3.59, 5.87, 3.83, 6.03, 4.89, 4.32, 4.69)
r <- mkTrend(x)
r_cpp <- mkTrend(x, IsPlot = TRUE)