OMbook_glossary

This is about whether an item in a multi-item self-report questionnaire is cued negatively, e.g....

There's a sometimes heated debate about whether the term "consistency" is or isn't more appropriate...

Oversimplifying only a little, IRT, with Classical Test Theory (CTT), makes the two main, and...

This is a little bit esoteric and mathematical perhaps but I keep forgetting the symbols Details An...

Censored data (see entry) is data where at least some values are not know accurately...

No, not when someone imputes malevolent intention to your attempt to help! In research...

The intercept, with the slope, define a linear regression. Details It's just this point (in the plot...

What it says: an interview that produces a measure score, or, reifying things a bit,...

You may come across this in reports of controlled trials of therapies (or of anything...

You may hit this term in systematic review and meta-analyses. It's the latest, and...

There are separate entries (see "try also") for idiographicm, sometimes spelled "ideographic", and nomothetic measures,...

Researcher bias/allegiance are synonyms. Basically the simple idea that investigators/researchers tend to hold views that constitute...

This is an absolutely fundamental aspect of all statistical methods: the idea that all the...

This approach to evaluating findings starts out with an idea that it is worth investigating...

One way to assess how good, how usable, a rating system is is to get...

Contamination of scores by systematic error, see large entry for validity and entries for its...

Most thinking about change/outcome data is of "internal" analyses: analyses within one local dataset and...

his is about Stevens' typology of scales and most of the time it's a red...

[see quartiles!] The “interquartile range” is the distance between the 25th centile (the score such that...

In statistics, Interaction describes the situation in which two Predictor Variables combine to have a...

Term sometimes used for Predictor variable when looking at the relationship with a Dependent variable....

When we seek consent from our clients for participating in a treatment or in a...

An idiographic measure gives a picture (“graphic”) unique to the individual (“idio”). For example, a...