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What is VALIDITY?

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by

Mary Nagel

on 3 October 2013

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Transcript of What is VALIDITY?

What is VALIDITY?

Erica, Hana, Paul and Mary

"The degree to which an observed result, such as a difference between two measurements, can be relied upon and not attributed to random error in sampling or in measurement." (seotermglossary)

Consistent pattern representing population


Subtypes
Criterion

Discriminant

Predictive

Purpose
Assess the validity of depression assessments, BDI and GHQ based on the prestablished validity of CIDI assessment.

Beck Depression Inventory
BDI-21, BDI-13, BDI-6
Generic Health Questionnaire
GHQ-12
Composic International Diagnostic Interview
CIDI
CIDI
Positives of CIDI

valid and reliable
severe depression
in-person
unbiased
golden standard
validation criterion
prevalence of depressive disorders: chronic and major depressive disorders
alcohol and anxiety disorder
Results
Severity of depression
"pure depression" diagnosis scored higher than "pure anxiety" or "pure alcohol use"
AUC --> gender differences
No major difference in terms of accuracy among the BDI scales
All scales performed better among men than women
Example BDI-6 Topics

Validity
Negatives of CIDI
time consuming
expensive
limits population
limits time frame
only valid in population context not case finding
GHQ vs. BDI
GHQ
Screening instrument
Good psychometric properties have been reported
GHQ-12 developed for measuring
anxiety and depression
Social dysfunction and loss of confidence
BDI
Originally developed as a measure of the intensity of depression
Addresses the severity of cognitive and somatic aspects of depression
Discussion Questions
1.Reliability vs. Validity
Which is more important?


2.Why did the results of the study find a difference between men and women in terms of consistency in survey data?



AUC (Area Under a ROC Curve)
values indicate overall accuracy of scales
Mood, Pessimism, Dissatisfaction, Guilt, Self-dislike, Indecisiveness
Discussion Questions Continued
3.Given that the CIDI does have limitations, can there be a golden standard for assessing psychiatric disorders (or general self-reporting assessments)?

4. Do you think length is a factor in high-quality results?
Full transcript