Psychometric and Classification Properties of the Peas in a Pod Questionnaire
Avery AR, Turkheimer E, Tsang S, Duncan GE We examined the item properties of the Two Peas Questionnaire (TPQ) among a sample of same-sex twin pairs from the Washington State Twin Registry. With the exception of the ‘two peas’ item, three of the mistakenness items showed differential item functioning. Results showed that the monozygotic (MZ) […]