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sitar (version 1.0.4)

Super Imposition by Translation and Rotation Growth Curve Analysis

Description

Functions for fitting and plotting SITAR (Super Imposition by Translation And Rotation) growth curve models. SITAR is a shape-invariant model with a regression B-spline mean curve and subject-specific random effects on both the measurement and age scales.

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Version

Install

install.packages('sitar')

Monthly Downloads

730

Version

1.0.4

License

GPL (>= 2)

Maintainer

Tim Cole

Last Published

March 22nd, 2016

Functions in sitar (1.0.4)

sitar

Fit SITAR growth curve model
BICadj

Ways to compare SITAR models for fit
funcall

Function call with optional inverse
cLMS

LMS conversion to and from z-scores
codeplot

Plot and zap velocity outliers in growth curves
makess

Create cubic smoothing spline from data
predict.sitar

Predict SITAR model
ifun

Invert an expression defining a data transformation
z2cent

Express z-scores as centile character strings for plotting
heights

Serial heights measured in 12 girls
sitar-package

SITAR (SuperImposition by Translation And Rotation) growth curve analysis
plot.sitar

Plot SITAR model
uk90

UK 1990 growth reference
getCovariate.sitar

Extract Covariate from a SITAR object
who06

The WHO 2006 growth standard
summary.sitar

Create summary of SITAR model
print.sitar

Print SITAR model
getData.sitar

Extract SITAR object data
anova.sitar

Compare Likelihoods of Fitted SITAR Objects
LMS2z

Convert to/from measurement from/to z-score with growth reference
subsample

Sample from SITAR dataset
ukwhopt

UK-WHO growth reference including preterm
mplot

Plot multiple growth curves
getVarCov.sitar

Extract variance-covariance matrix for SITAR models
LMSfit

Estimate LMS curves from tabulated growth reference centiles
xaxsd

Par args xaxs and yaxs option d
bupdate

Update the b fixed effect to minimise the b-c random effect correlation
recalib

Recalibrate x, y data using SITAR random effects
velout

Identify outliers with abnormal velocity in growth curves
plotclean

Plot multiple growth curves to identify outliers
print.summary.sitar

Print summary of SITAR model
y2plot

Plot with two y axes
xyadj

Adjust x and y variables for SITAR random effects