rtrend (version 0.1.5)

slope_sen: slope

Description

• slope : linear regression slope

• slope_p : linear regression slope and p-value

• slope_mk : mann kendall Sen's slope and p-value

• slope_sen : same as slope_mk, but with no p-value

• slope_boot: bootstrap slope and p-value

Usage

slope_sen(y, x = NULL)
slope(y, x, ...)
slope_p(y, x, fast = TRUE)
slope_sen_r(y, x = seq_along(y), ...)
slope_mk(y, x = NULL, ...)
slope_boot(y, x = NULL, slope_FUN = slope, times = 100, alpha = 0.1, seed, ...)

Value

• slope : linear regression coefficient

• pvalue : p-value <= 0.05`` means that corresponding slope` is significant.

• sd : Std. Error

For slope_boot, slope is estimated in many times. The lower, mean, upper and standard deviation (sd) are returned.

Arguments

y

vector of observations of length n, or a matrix with n rows.

x

vector of predictor of length n, or a matrix with n rows.

...

ignored.

fast

Boolean. If true, stats::.lm.fit() will be used, which is 10x faster than stats::lm().

slope_FUN

one of slope(), slope_p(), slope_mk()

times

The number of bootstrap replicates.

alpha

significant level, defalt 0.1

seed

a single value, interpreted as an integer, or NULL (see ‘Details’).

Examples

y <- c(4.81, 4.17, 4.41, 3.59, 5.87, 3.83, 6.03, 4.89, 4.32, 4.69)
r <- slope(y)
r_p <- slope_p(y)
r_mk <- slope_mk(y)
r_boot <- slope_boot(y)