OM book glossary

This is the glossary for the book “Outcome measures and evaluation in counselling and psychotherapy” written by myself and Jo-anne Carlyle and available now from SAGE. I am over 430 entries now and still climbing though now (April 2026) I am concentrating more on harmonising, cleaning up and cross-linking existing entries than I am on adding new ones. Some glossary entries link to more detailed expansions of the topic in my Rblog and, at last, an increasing number now link with interactive online (“shiny”) apps.

You can see the alphabetical list of entries below which is a good place to browse, or you can use this search box.

Beware: the way the search orders the matches is to my mind bizarre so scroll down if what you typed isn’t first on the list, you may find something with exactly the title that is exactly the phrase you typed in to find is hidden down the list of suggestions.

If what you want is not there and you think it should be, contact me and tell me and I will put it on the (long!) list of entries to be added!

T

t-test = "Student's t-test"

Historically one of the paradigmatic, genuinely paradigm changing, statistical "tests". It tests how likely it…

The unconscious (Ucs)

Well this is either very simple or very complicated. I am a believer in…

Tukey’s seven-number summary

One of three different "seven number" summaries of the distribution of a set of scores….

The 3 E's: Efficacy, Effectiveness & Efficiency

From the hugely influential monograph: Cochrane, A. L. (1972). Effectiveness and efficiency. Random reflections on…

tmp

This exists, I hope very temporarily, to explore an issue I am having with BetterDocs…

Type II censored data

I am putting this here because I know I won't remember it but I think…

Type I censoring

I am putting this here because I know I won't remember it but I think…

Triple/treble blind

An interesting extension of the double blind methodology. In double blind trials the participants…

Test-retest effect/artefact/artifact

I think we should really say "test-retest effect" and I often put scare quotes around…

Thought experiment (Gedankenexperimenten)

Exactly what it says! Some sort of experiment, i.e. an intervention with observed consequences, is…

More

Creation date lost, updated 19.v.24 to add the new BetterDocs “encyclopedia” listing of entries, tweaks 13.iv.26. Author CE; this page and all glossary contents are copyright to me so contact me if you want to quote from them (I’m sure I’ll agree!). That may change to a Creative Commons licence later when I am happier with the content.