The classification scheme used here is possibly the clearest one I’ve had the chance to see, one I wish I had seen in use at every place I worked at. Here are the broad categories:

  • Surrogate variable that is measured: the thing we measure because it is measurable
  • Variable of true or greater interest: the thing we actually want to know about
  • Measurement technique of surrogate variable: whether we have the ability to get the actual direct value, or whether it is rather inferred from other observations
  • Atrefactual influences: what are the things that can mess up the data in measuring it
  • Certainty of “Normal Range”: how sure are we that the value we read is representative of what we care about?

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www.joshbeckman.org/notes/261162624