Cronbach's coefficient alpha
Despite much criticism, almost all of it criticising people for using Cronbach's alpha without really...
Content validity
This is mainly about typical multi-item nomothetic self-rating questionnaires or rating scales. Content validity...
Cutting points
In our field this refers to scores that are deemed to separate "help seeking" and...
Cluster analysis
Pretty much what it says: a family of statistical methods that look to see if...
Cross-lagged correlation
What it says really! A statistical method that explores the relationship between two variables...
Change vs. outcome
This is just my own pedantry and here to encourage others to think about it...
Covert vs. overt items
The name is pretty accurate: it's about whether items in self-report questionnaires are overt about...
Clinician-reported outcome measures (ClinROMs, CROMs)
These are a subset of Clinical Outcome Assessments (COAs) and were essentially the only change/outcome...
Clinical Outcome Assessments (COAs)
Term used more in the physical health than the psychological health & well-being areas. ...
Censored data
Censored data exists when the value of an observation is not fully known but is...
Classical Test Theory (CTT)
This is one of the two main statistical/mathematical approaches to quantitative psychometrics of the last...
Confidence intervals (CIs)
This is an incredibly useful method. The basic idea is that when you have a...
Chaos, chaos theory
Arts therapists, like many artists and other "creatives" argue that creativity, i.e. the emergence of...
Convergent validity
Part of concurrent validity (q.v.). Convergent validity is evidence that data from a measure...
Concurrent validity
Literally evidence supporting the validity of a measure that is obtained from data obtained at...
Crown-Crisp Experiential Index (CCEI)
Hm, I thought this would be quick and easy but I think it's going...
Composite scores
What it says: making up a score by adding up other things. Despite that...
Centring/Centering
A bit esoteric but you may meet it in reports, particularly those using multi-level modelling...
CORE-14-DD
This is a convenience name for the presentation together of 14 items of the CORE-OM...
Clinically significant change (CSC)
Part of the "Reliable and Clinically Significant Change (RCSC)" methods developed by Jacobson et al. Details I...
Cumulative distribution
It's pretty much what it says: putting the data you have in order so that...
Cramer von Mises test
A good test of distribution fit. (That's a graphic from my Rblog post about...
CORE system
CORE stands for "Clinical Outcomes in Routine Evaluation" and is the the system co-created by...
CORE instruments
Term I use to cover the self-report questionnaires of the CORE system ("CORE measures") together...
CORE measures
These are a set of self-report questionnaires designed primarily to measure change in therapies. ...
Cohen's kappa
Jacob Cohen invented kappa as a way of describing how good agreement was between two...
Confidentiality
Means exactly what it says! Details Confidentiality will be a key issue except in a fairly small...
Central location
A statistic for data from a continuous variable that summarise what it says: central location....
Computer intensive statistics/methods
These are methods that use a lot of computing power and they only really became...
Cell and cell size
Mostly "cell" in statistical work refers to a group of observations sharing two or more...
Controlled trials
These are experiments comparing two or sometimes more groups, typically in our field these involve...
Causality & causal attribution
Perhaps it's understandable that work committed to helping with human misery and self-destructiveness should want...
Clinical/non-clinical
Terms widely used to distinguish a section of the population who may have sufficient problems...
Corrected item-total correlations (CITCs)
This is most used when looking at the psychometric properties of multi-item scales and it...
Categorical/nominal data/scaling
This is about Stevens' typology of scales and it's probably the only bit of his...
Cochrane (collaboration, library)
Cochrane, https://www.cochrane.org/, formerly the Cochrane collaboration, aims to provide high quality, independent evidence in healthcare....
Common factors
This phrase has two meanings in our field: a psychological/therapy one, and a statistical/psychometric one.The...
CORC: Child Outcomes Research Consortium
Leading UK organisation aiming to improve understanding of effective interventions to help young people with...
CORE: Clinical Outcomes in Routine Evaluation
CORE refers both to a set of instruments, i.e. self-rating questionnaire measures and practitioner completed...
Correlation
The statistical meaning of Correlation is not that far from the lay use. If you...