to.unbalanced: Transform data to the longitudinal unbalanced format

Description

Transforms a longitudinal data set in the balanced format to the unbalanced format.

Usage

to.unbalanced(data, id.col, times, Y.col, other.col = NA)

Value

A data frame with longitudinal data in the unbalanced format. The unbalanced format is considered in this context as the format where each row has data on each subject observation.

Arguments

data: a data frame with longitudinal data in the balanced format. That is, in the format of 'one row per subject'. data, where the patient identifications is.
id.col: a column number, or column name, in the data frame data, where the patient identifier is located.
times: a vector with the unique time points where the patients are observed. This is the study design time points in a balanced data set.
Y.col: a vector of column numbers, or column names, of longitudinal variables, and/or time dependent covariates in the data frame data.
other.col: a vector of column numbers, or column names, of baseline covariates, and/or other subject level data, as for example, survival data. Default does not include other.col.

Author

Ines Sousa

Examples

Run this code

simul <- data.frame(num = 1:10,
                    Y1.1 = rnorm(10), Y1.2 = rnorm(10),
                    Y2.1 = rnorm(10), Y2.2 = rnorm(10), 
                    age = rnorm(10))
to.unbalanced(simul, id.col = 1, times = c(1, 2), Y.col = 2:5,
              other.col = 6)