| Name : R-brokenstick
| |
| Version : 2.5.0
| Vendor : obs://build_opensuse_org/devel:languages:R
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| Release : lp156.6.1
| Date : 2024-09-10 16:06:36
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| Group : Development/Libraries/Other
| Source RPM : R-brokenstick-2.5.0-lp156.6.1.src.rpm
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| Size : 1.46 MB
| |
| Packager : https://www_suse_com/
| |
| Summary : Broken Stick Model for Irregular Longitudinal Data
|
Description :
Data on multiple individuals through time are often sampled at times
that differ between persons. Irregular observation times can severely
complicate the statistical analysis of the data. The broken stick model
approximates each subject’s trajectory by one or more connected line
segments. The times at which segments connect (breakpoints) are
identical for all subjects and under control of the user. A
well-fitting broken stick model effectively transforms individual
measurements made at irregular times into regular trajectories with
common observation times. Specification of the model requires three
variables: time, measurement and subject. The model is a special case
of the linear mixed model, with time as a linear B-spline and subject
as the grouping factor. The main assumptions are: subjects are
exchangeable, trajectories between consecutive breakpoints are
straight, random effects follow a multivariate normal distribution, and
unobserved data are missing at random. The package contains functions
for fitting the broken stick model to data, for predicting curves in
new data and for plotting broken stick estimates. The package supports
two optimization methods, and includes options to structure the
variance-covariance matrix of the random effects. The analyst may use
the software to smooth growth curves by a series of connected straight
lines, to align irregularly observed curves to a common time grid, to
create synthetic curves at a user-specified set of breakpoints, to
estimate the time-to-time correlation matrix and to predict future
observations. See < doi:10.18637/jss.v106.i07> for additional
documentation on background, methodology and applications.
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RPM found in directory: /packages/linux-pbone/ftp5.gwdg.de/pub/opensuse/repositories/devel:/languages:/R:/autoCRAN/15.6/x86_64 |
