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Results tagged with psychometrics
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user 9162
Psychometrics has evolved as a subfield of psychology to become the science of measurement of unobservable individual characteristics.
2
votes
How can there be a standard deviation of true scores?
I've found an answer, although not one that I find particularly satisfying.
Here on p9 of the book "Handbook of Psychological and Educational Assessment of Children it is written:
"The standard err …
3
votes
1
answer
2k
views
Why don't we square the reliability correlation when calculating reliable variance?
This question relates to situations where we apply some test to the same people at Time 1 and Time 2, and then calculate the correlation between scores at Time 1 and Time 2.
I am reading the book Pr …
3
votes
5
answers
891
views
How can there be a standard deviation of true scores?
Dudek (1979) describes the following formula as "the standard deviation of true scores when
the observed score is held constant" (p. 337):
$SE_{est} = SD \sqrt{(reliability × (1 - reliability))}$
…
4
votes
1
answer
3k
views
What's an intuitive way to explain the different types of validity?
Specifically I'm thinking of a simplified division whereby validity is divided into:
Construct validity
1a. Convergent validity
1b. Discriminant validity
Criterion related validity
2a. Predictive va …
9
votes
4
answers
473
views
How should I approach this binary prediction problem?
I've got a dataset with the following format.
There's a binary outcome cancer/no cancer. Every doctor in the dataset has seen every patient and given an independent judgment on whether the patient …
7
votes
3
answers
1k
views
What is the reasoning behind the formulae for the different standard errors of measurement?
McManus (2012) discusses the three standard errors of measurement and provides the following definitions.
$SE_{meas} = SD \sqrt{(1 - reliability)}$
The standard error of measurement is an estimate o …