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Advancing the construct validity of the Early Communication Indicator (ECI) for infants and toddlers: Equivalence of growth trajectories across two early head start samples

Language DevelopmentEducationPreschool DevelopmentEarly Childhood LanguageSocial SciencesPsychologyChild LanguageCognitive DevelopmentConstruct ValidityChild PsychologyEarly Childhood DevelopmentEarly Communication IndicatorGrowth TrajectoriesGlobal Developmental DelayInfant CognitionChild DevelopmentEarly EducationInfant DevelopmentPediatrics