sitar

Ways to compare SITAR models for fit

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

Estimate LMS curves from tabulated growth reference centiles

Compare Likelihoods of Fitted SITAR Objects

Bootstrap standard errors for SITAR peak velocity and age at peak velocity

The Berkeley Child Guidance Study

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

LMS conversion to and from z-scores

The CDC 2000 growth reference

Plot and zap velocity outliers in growth curves

Deren prevalence data on child thinness, overweight and obesity

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

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

Function call with optional inverse

Extract elements of fitted SITAR models

Identify peak or trough on curve

Serial heights measured in 12 girls

Invert an expression defining a data transformation

IOTF international body mass index reference

Plot multiple growth curves

Convert between IOTF, WHO and CDC prevalence rates for child thinness, overweight and obesity

Optimal design for growth reference centile studies

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

Pipe operator

Plot SITAR model

Plot multiple growth curves to identify outliers

Predict SITAR model

Print SITAR model

Print summary of SITAR model

Recalibrate x, y data using SITAR random effects

Fit SITAR growth curve model

SITAR (SuperImposition by Translation And Rotation) growth curve analysis

Sample from SITAR dataset

Create summary of SITAR model

Select equally spaced ages from a vector of ages

UK 1990 growth reference

UK-WHO growth reference including preterm

UK-WHO growth reference omitting preterm data

Identify outliers with abnormal velocity in growth curves

The WHO 2006 growth standard

The WHO 2006 growth standard and WHO 2007 growth reference

Par args xaxs and yaxs option d

Adjust x and y variables for SITAR random effects

Express z-scores as centile character strings for plotting