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sitar (version 1.0.5)

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

437

Version

1.0.5

License

GPL (>= 2)

Maintainer

Tim Cole

Last Published

April 12th, 2016

Functions in sitar (1.0.5)

BICadj

Ways to compare SITAR models for fit
bupdate

Update the b fixed effect to minimise the b-c random effect correlation
plot.sitar

Plot SITAR model
print.summary.sitar

Print summary of SITAR model
heights

Serial heights measured in 12 girls
cLMS

LMS conversion to and from z-scores
funcall

Function call with optional inverse
mplot

Plot multiple growth curves
summary.sitar

Create summary of SITAR model
xaxsd

Par args xaxs and yaxs option d
getData.sitar

Extract SITAR object data
ukwhopt

UK-WHO growth reference including preterm
uk90

UK 1990 growth reference
ifun

Invert an expression defining a data transformation
predict.sitar

Predict SITAR model
velout

Identify outliers with abnormal velocity in growth curves
plotclean

Plot multiple growth curves to identify outliers
makess

Create cubic smoothing spline from data
subsample

Sample from SITAR dataset
z2cent

Express z-scores as centile character strings for plotting
recalib

Recalibrate x, y data using SITAR random effects
sitar-package

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

Print SITAR model
who06

The WHO 2006 growth standard
y2plot

Plot with two y axes
codeplot

Plot and zap velocity outliers in growth curves
LMS2z

Convert to/from measurement from/to z-score with growth reference
getVarCov.sitar

Extract variance-covariance matrix for SITAR models
sitar

Fit SITAR growth curve model
anova.sitar

Compare Likelihoods of Fitted SITAR Objects
LMSfit

Estimate LMS curves from tabulated growth reference centiles
xyadj

Adjust x and y variables for SITAR random effects
getCovariate.sitar

Extract Covariate from a SITAR object