NTIESNational Treatment Improvement Evaluation Study
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NTIES data include prospective data on organizational, service, and individual client characteristics and, as such, provide the opportunity to examine the relation among specific service delivery characteristics like client need-service matching and treatment outcome while controlling for client and organizational variables.
Control variables were included that were theoretically and empirically significant in previous research using the NTIES data set (Marsh et al.
Second, to account for potential correlation within service delivery units, a risk in multilevel data sets like NTIES, an exchangeable covariance structure was assumed among clients within the same service delivery organization.