smocc_200

Longitudinal height and weight measurements during ages 0-2 years for a
representative sample of 1933 Dutch children born in 1988-1989. The dataset
<code>smocc_200</code> is a subset of the full data covering 200 children.

datasets

The broken stick model describes a set of individual curves by a
linear mixed model using a second-order linear B-spline. The main use of the model
is to align irregularly observed data to a user-specified grid of break ages.
All fitting can done in the Z-score scale, so non-linearity and irregular data
can be treated as separate problems. This package contains functions for fitting
a broken stick model to data, for predicting broken stick curves in new data,
and for plotting the broken stick estimates. For additional documentation on
background, methodology and applications of the broken stick model see
<https://stefvanbuuren.name/publications/2020_Brokenstick_JSS_manuscript.pdf>.

Stef van Buuren

brokenstick

Broken Stick Model for Irregular Longitudinal Data

smocc_200 function

A tibble with 1940 rows and 7 columns:<dl class="dl-horizontal">
<dt>id</dt><dd>ID,
unique <code>id</code> of each child (numeric)</dd> <dt>age</dt><dd>Decimal age, 0-2.12
years (numeric)</dd> <dt>sex</dt><dd>Sex, <code>"male"</code> or <code>"female"</code>
(character)</dd> <dt>ga</dt><dd>Gestational age, completed weeks (numeric)</dd>
<dt>bw</dt><dd>Birth weight in grammes (numeric)</dd> <dt>hgt</dt><dd>Height measurement in
cm (34-102) (numeric)</dd> <dt>hgt.z</dt><dd>Height in SDS relative Fourth Dutch
Growth Study 1997 (numeric)</dd> </dl>

Format

Infant growth of 0-2 years, SMOCC data extract — smocc_200

A tibble with 1940 rows and 7 columns:<dl class='dl-horizontal'>
<dt>id</dt><dd>ID,
unique <code>id</code> of each child (numeric)</dd> <dt>age</dt><dd>Decimal age, 0-2.12
years (numeric)</dd> <dt>sex</dt><dd>Sex, <code>"male"</code> or <code>"female"</code>
(character)</dd> <dt>ga</dt><dd>Gestational age, completed weeks (numeric)</dd>
<dt>bw</dt><dd>Birth weight in grammes (numeric)</dd> <dt>hgt</dt><dd>Height measurement in
cm (34-102) (numeric)</dd> <dt>hgt.z</dt><dd>Height in SDS relative Fourth Dutch
Growth Study 1997 (numeric)</dd> </dl>

smocc_200: Infant growth of 0-2 years, SMOCC data extract

Description

Arguments

Format