get_trial_arm_details: Function to get the details of the trial arm
Description
Function to get the details of the trial arm
Usage
get_trial_arm_details(trialdata)
Value
the name of the variable related to trial arm and the unique contents
if success, else error
Arguments
trialdata,
data containing individual level trial data
Details
expecting the data contains the information on trial arm
preferably column names "arm", "trial" or "trial arm". If
multiple column names
match these, then first match will be chosen.