Test for Indifference of Indicator
Description
Provides item exclusion procedure, which is a formal method to
test 'Indifference Of iNdicator' (ION). When a latent personality
trait-outcome association is assumed, then the association strength
should not depend on which subset of indicators (i.e. items) has been
chosen to reflect the trait. Personality traits are often measured
(reflected) by a sum-score of a certain set of indicators.
Item exclusion procedure randomly excludes items from a sum-score and
tests, whether the sum-score - outcome correlation changes. ION has been
achieved, when any item can be excluded from the sum-score without the
sum-score - outcome correlation substantially changing . For more details,
see Vainik, Mottus et. al, (2015) "Are Trait-Outcome Associations Caused
by Scales or Particular Items? Example Analysis of Personality Facets and
BMI",European Journal of Personality DOI: <10.1002/per.2009> .