tukey_weight

Computes Tukey bisquare weights for standardized values.
Returns <code>(1 - (u/k)^2)^2</code> for values within the tuning
constant and 0 for values outside.

internal

Provides methods for imputation and visualization of
missing values. It includes graphical tools to explore the amount, structure
and patterns of missing and/or imputed values, supporting exploratory
data analysis and helping to investigate potential missingness mechanisms
(details in Alfons, Templ and Filzmoser, <doi:10.1007/s11634-011-0102-y>).
The quality of imputations can be assessed visually using a wide range of
univariate, bivariate and multivariate plots.
The package further provides several imputation methods,
including efficient implementations of k-nearest neighbour and hot-deck
imputation (Kowarik and Templ 2013, <doi:10.18637/jss.v074.i07>),
iterative robust model-based multiple
imputation (Templ 2011, <doi:10.1016/j.csda.2011.04.012>;
Templ 2023, <doi:10.3390/math11122729>), and machine learning–based
approaches such as robust GAM-based multiple imputation
(Templ 2024, <doi:10.1007/s11222-024-10429-1>) as well as random forest
and gradient boosting (XGBoost) imputation
(Niederhametner et al., <doi:10.1177/18747655251339401>).
General background and practical guidance on imputation are provided in the
Springer book by
Templ (2023) <doi:10.1007/978-3-031-30073-8>.

Matthias Templ

Visualization and Imputation of Missing Values

Alexander Kowarik

Andreas Alfons

Johannes Gussenbauer

Nina Niederhametner

Eileen Vattheuer

Gregor de Cillia

Bernd Prantner

Wolfgang Rannetbauer

tukey_weight function

<dl><dt>u</dt>
<dd>numeric vector of standardized values</dd>
<dt>k</dt>
<dd>tuning constant, Default: 4.685</dd></dl>

Arguments

Author

Tukey bisquare weight function — tukey_weight

<dl>

<dt>u</dt>
<dd>numeric vector of standardized values</dd>


<dt>k</dt>
<dd>tuning constant, Default: 4.685</dd>

</dl>

Tukey bisquare weight function

tukey_weight: Tukey bisquare weight function

Description

Usage

Value

Arguments

Author