Statistical Tools

Analyses of randomized long term follow-up studies of critically ill patients are complicated due to high mortality and missing data among survivors. We have developed a software tool that imputes missing data among survivors and then implements several common statistical methods that address truncation due to mortality when evaluating long term functional (non-mortality) outcomes. The software utilizes Shiny, R and C++ code. The required software is completely contained in the available download; i.e. no need to have R installed on your computer. The software contains documentation and an example dataset for exploring the methods.


1. Determine whether you’re running a 32-bit or 64-bit version of Windows

2. Download the correct version of the app (either 32- or 64-bit)

3. Unzip the file

4. Open the executable file “run_composite.exe”

5. Extract all files (you will receive the prompt to extract automatically when you try to open “run_composite.exe”)

6. Once again open the executable file “run_composite.exe”

The procedure for checking if your device is running 32-bit or 64-bit varies slightly based on what version of Windows you’re running (i.e. Windows 7 vs 8 vs 10, etc.). This link has an automatic detection feature built in as well as instructions for manually determining the operating system on your computer.