A clinical psychologist designs a new 10-item self-report scale, the Depressive Symptom Screener (DSSDSSDSS), to rapidly assess depressive symptoms. To evaluate the instrument, the psychologist administers both the DSS DSS\,DSS and the well-established Beck Depression Inventory (BDI-IIBDI\text{-}IIBDI-II) to a cohort of 120 patients during the same clinical assessment, obtaining a high positive correlation between the two sets of scores (r=+0.86r = +0.86r=+0.86).
Which type of validity has been demonstrated by this high correlation?
Face validity
Ecological validity
Predictive validity
Concurrent validity
