out_hampel_filter: Hampel filter

In sapfluxnet/sapfluxnetQC2: Package for Level 2 QC od SAPFLUXNET data

Description

Hampel filter for detecting and substituting outliers in the environmental and sap flow data.

Usage

out_hampel_filter(y, k = 5L, t0 = 3L, method = "hampel", reverse = TRUE,
  parent_logger = "test")

Arguments

y	vector of values for outlier substitution
k	window semi-value (integer) for substitution value calculation. See details.
t0	Integer value indicating the number of standard deviations for outlier detection threshold.
method	Character vector indicating the method to use in the estimation: hampel (default), tukey and quantile.
reverse	Logical indicating if in case of k is bigger than the data length (i.e in the extremes of the vector) a reverse replication must be done. Default to TRUE.

Details

This is a modified version of the Hampel filter to avoid breaking when NAs are present in the data. Options include the posibility of using the median (classic Hampel, default), tukeyline or quantile regression estimations.

Value

A list with two elements:

• res: A vector of the same length as y with the ouliers value substituted by the estimation

• index: A vector indicating which TIMESTAMPS have been modified

See Also

Other outliers: out_remove, outlier_subs

sapfluxnet/sapfluxnetQC2 documentation built on May 29, 2019, 1:50 p.m.