R: Creates an aee object

aee	R Documentation

Creates an aee object

Description

Creates an aee object for semiparametric regression with augmented estimating equation.

Usage

aee(ID, time, minutes)

Arguments

`ID`	Individual identifier
`time`	Observation time
`minutes`	Minutes of physical activity

Value

`psDF`	A data frame, part of original input data frame with variable "ID", "time" and "count"
`timeGrid`	Ordered distinct observation times in the set of all observation times
`panelMatrix`	a matrix representation of panel count data, one row per subject, one column per time point in "timeGrid"

Author(s)

Jaejoon Song <jjsong2@mdanderson.org>

References

Wang, X. and Yan, J. (2011). Fitting semiparametric regressions for panel count survival data with an R package spef. Computer Methods and Programs in Biomedicine, 104, 278-285.

Wang, X., Ma, S., and Yan, J. (2013). Augmented estimating equations for semiparametric panel count regression with informative observation times and censoring time. Statistica Sinica, 23, 359-381.

Examples

## Not run: 
# We illustrate the use of function aeexfit
# with the sample data from the National Health and Nutrition Examination Survey (NHANES) 
# to examine the association between the cardiorespiratory function (i.e., VO2max) 
# and daily minutes of moderate to vigorous physical activity (MVPA).

data(NHANES)
formula <- aee(ID, Day, mvpaMinutes) ~ VO2max
# Standard errors are obtained using sandwich estimation
fitted <- aeexfit(formula = formula, data = NHANES, se = "Sandwich")
summary(fitted)

## End(Not run)