Everyone has some valid trait that is useful to society in one way or another.
Psychometric properties of this Dutch 11-item version are not available but the original PSWQ has been proven to be a valid measure of trait worrying unaffected by the content of the worry (Davey 1993; Molina and Borkovec 1994) with high internal consistency, good test retest reliability and unaffected by social desirability (Meyer et al. 1990).
It also presupposes that the measures included will have well-understood psychometric properties, that is, that they are (a) valid (measure latent traits specifically associated with (un)successful real-world listening) and (b) reliable (consistently sensitive to the trait that they are designed to measure, both within and among individuals).
Conners ADHD is a valid assessment of ADHD traits; individuals with ADHD display significantly higher scores on the measure than controls [ 26].
There are many reasons why the association analyses could have limited success in detecting an association between a valid selection-candidate gene and trait variation in teosinte.
However, demographic processes (as opposed to selective pressure) playing a significant role in the spread of the trait constitutes a valid, mutually non-exclusive alternative explanation [ 18– 22].
This information can be useful in identifying items that do not contribute to a valid measure of the underlying trait, as well as potential response biases related to respondent characteristics, such as age or gender.
Note that some data patterns are rather unlikely, e.g., the probability of observing a valid observation for the first trait of the first twin only, while all other observations in the family are missing, is.8* .2) = 1.024−05.
Though SRS is a valid quantitative measure of autistic traits, the instrument lacks the ability to distinguish autism from the spectrum (Asperger's disorder and PDD-NOS) in individuals with ASD [ 8].
Because the success of both association analysis and genomic prediction is dependent on the trait heritability, heritability can be a valid target for refining multivariate disease phenotypes.
