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sitar

Growth curve analysis

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install.packages('sitar')

Monthly Downloads

581

Version

1.1.0

License

GPL (>= 2)

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Repository

https://github.com/statist7/sitar

Maintainer

Tim Cole

Last Published

June 19th, 2018

Functions in sitar (1.1.0)

LMS conversion to and from z-scores

Recalibrate x, y data using SITAR random effects

Fit SITAR growth curve model

Print SITAR model

Create summary of SITAR model

Select equally spaced ages from a vector of ages

Express z-scores as centile character strings for plotting

print.summary.sitar

Print summary of SITAR model

Identify outliers with abnormal velocity in growth curves

Sample from SITAR dataset

UK-WHO growth reference including preterm

UK 1990 growth reference

The WHO 2006 growth standard

Par args xaxs and yaxs option d

Adjust x and y variables for SITAR random effects

SITAR (SuperImposition by Translation And Rotation) growth curve analysis

Plot and zap velocity outliers in growth curves

Compare Likelihoods of Fitted SITAR Objects

Tabulate BIC of SITAR models by degrees of freedom and xy power transformations

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

Find degrees of freedom for a natural spline curve to minimise BIC or AIC

Ways to compare SITAR models for fit

The Berkeley Child Guidance Study

Estimate LMS curves from tabulated growth reference centiles

Extract elements of fitted SITAR models

Invert an expression defining a data transformation

Plot multiple growth curves

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

Plot SITAR model

Plot frequency distributions(s) for given L, M and S values in LMS method

Plot multiple growth curves to identify outliers

Function call with optional inverse

Identify peaks and troughs of curve

Serial heights measured in 12 girls

Predict SITAR model