epts (version 1.2.1)

srtAddIntervention: Add a New Intervention Group to Simple Randomized Trial (SRT) Data

Description

This function adds a new intervention group to an existing SRT dataset by generating new participant-level data.

Usage

srtAddIntervention(
  existing_data,
  np,
  es,
  attritionrate,
  outcome,
  interventions,
  id,
  continuous_covariates,
  categorical_covariates
)

Value

A data.frame combining the original dataset with the newly simulated intervention group.

Arguments

existing_data

A data frame containing the variables including outcome, predictors, the clustering variable, and the intervention for CRT design.

np

The number of new participants to generate for the new intervention group.

es

The standardized effect size for the new intervention group.

attritionrate

The proportion of pupils in the new group to drop due to attrition.

outcome

A string specifying the name of the column containing outcome variable (post-test scores).

interventions

A string specifying the name of the intervention assignment column.

id

A string specifying the name of the participant ID column.

continuous_covariates

A character vector specifying the names of continuous covariates.

categorical_covariates

A character vector specifying the names of categorical covariates (converted to factors).

Examples

data(srt4armSimData)
new_srt5armData <- srtAddIntervention(existing_data = srt4armSimData, np = 100, 
es = 0.3, attritionrate = 0.1, outcome = "posttest", interventions = "interventions",
id = "ID", continuous_covariates = c("pretest"), categorical_covariates = c("gender", "ethnicity"))
head(new_srt5armData)