Lecture 2 - Applied clinical psychometrics Flashcards
If a distribution is Gaussian, it means it is…
A) A normal distribution
B) A skewed distribution
A) A normal distribution
True or false, when scores fall along a Gaussian distribution, it means there is a simple correspondence between standard deviations and percentiles.
TRUE
True or false, IQ tests are an example of a test that produces a non-Gaussian distribution
FALSE
True or false, it is important to remember that functions cannot be “impaired”. Only scores can be impaired.
FALSE
True or false, all tests suffer from the problem of multiple determination.
TRUE
Name the three levels of sequential inference involved in clinico-psychometric assessments.
ETS - PS - UDC
- Elevated test scores
- Psychological syndromes
- Underlying disorders or causes
In this lecture, we learned about two main types of scales that are used in psychometrics. What were they?
RS - PS
- Rating scales
- Performance scales
True or false, RATING SCALES are typically Likert style that represent symptom severity, frequency etc
TRUE
Is the DASS-21 an example of a rating scale or a performance scale?
A rating scale
True or false, PERFORMANCE SCALES typically measure an ability or skill
TRUE
Is the WMS an example of a rating scale or a performance scale?
A performance scale
Of performance scales and rating scales, which scores typically have a “real world meaning”
Performance scales
(Note there are exceptions to this, but I doubt they are material to our exam)
In this lecture, we learned about three types of performance scales. What were they?
S - A - F
- Skill scales
- Ability scales
- Function scales
What type of performance scale would be used to assess things like reading, spelling, or playing the piano?
(Skill, ability, or function)
A skill scale
What type of performance scale would be used to assess things like visuospatial function, processing speed, working memory?
(Skill, ability, or function)
An ability test
Do ABILITIES (in the psychometric sense) typically have Gaussian or non-gaussian distributions?
(e.g., IQ)
Gaussian
What type of performance scale would be used to assess things like being able to move your mouth to produce sound, or sensation on your skin?
A function test
Do FUNCTIONS (in the psychometric sense) typically have Gaussian or non-gaussian distributions?
(e.g., having sensation on both sides of your face)
Non-Gaussian
In this lecture, we learned about THREE clinical considerations when assessing any sort of test score. What were they?
NA - MD - PS
- Normative analysis
- Multiple determination
- Pathognomonic status
The Z score MEAN is always 0. What is the equivalent T score, Index score, and Scale score?
T score = 50
Index score = 100
Scale score = 10
For Z scores, the SD is always 1. What is the SD value for T scores, Index scores, and Scale scores?
T score = 10
Index score = 15
Scale score = 3
For a Z score of -2, what is the equivalent T score, Index score and Scale score… and percentile?
T score = 30
Index score = 70
Scale score = 4
Percentile = 2nd
For a Z score of 1, what is the equivalent T score, Index score and Scale score… and percentile?
T score = 60
Index score = 115
Scale score = 13
Percentile = 84th
What is the percentile that corresponds to a Z score of 3?
99.87th
