title: Technical error of measurement (TEM) for 3 or more participants
body: <p>I need to implement this formula into an R function. To my surprise there were no R packages with a TEM function for 3 or more participants. Could someone help me out? </p>
  
  <p><img src="https://i.imgur.com/7UGK0O5.png" alt="TEM"></p>