piecewise_linear2_hinv

This function uses a 2-knot piecewise linear model to calculate inverse warping 
functions for registration. The parameters <code>knot1_x</code> and <code>knot1_y</code>
control the x and y locations of the first knot, and the parameters
<code>knot1_x</code> and <code>knot1_y</code> control the x and y locations of the second
knot. The designation (inverse) is intended to communicate that these 
functions take data from the unregistered space to the registered space, 
consistent with functional data literature on registration.

A method for performing joint registration and functional principal
component analysis for curves (functional data) that are generated from exponential family distributions. This
mainly implements the algorithms described in 'Wrobel et al. (2019)' <doi:10.1111/biom.12963> and further adapts them to potentially
incomplete curves where (some) curves are not observed from the beginning and/or until the end of the common domain. Curve registration
can be used to better understand patterns in functional data by separating curves into phase and amplitude variability.
This software handles both binary and continuous functional data, and is
especially applicable in accelerometry and wearable technology.

Julia Wrobel

registr

Curve Registration for Exponential Family Functional Data

Alexander Bauer

Erin McDonnell

Fabian Scheipl

Jeff Goldsmith

piecewise_linear2_hinv function

<dl><dt>grid</dt>
<dd>grid of values over which to evaluate the function.</dd>
<dt>knot_locations</dt>
<dd>controls the x and y locations of the two knots.</dd></dl>

Arguments

Erin McDonnell <a href="/link/eim2117%40cumc.columbia.edu?package=registr&version=2.1.0" data-mini-rdoc="registr::eim2117@cumc.columbia.edu">eim2117@cumc.columbia.edu</a>

Author

Create two-parameter piecewise linear (inverse) warping functions — piecewise_linear2_hinv

<dl>

<dt>grid</dt>
<dd>grid of values over which to evaluate the function.</dd>


<dt>knot_locations</dt>
<dd>controls the x and y locations of the two knots.</dd>

</dl>

Erin McDonnell <a href='mailto:eim2117@cumc.columbia.edu'>eim2117@cumc.columbia.edu</a>

piecewise_linear2_hinv: Create two-parameter piecewise linear (inverse) warping functions

Description

Usage

Arguments

Author