Confirmatory analysis of exploratively obtained factor structures

Factor structures obtained by exploratory factor analysis (EFA) often turn out to fit poorly in confirmative follow-up studies. In the present study, the authors assessed the extent to which results obtained in EFA studies can be replicated by confirmatory factor analysis (CFA) in the same sample. More specifically, the authors used CFA to test three different factor models on several correlation matrices of exploratively obtained factor structures that were reported in the literature. The factor models varied with respect to the role of the smaller factor pattern coefficients. Results showed that confirmatory factor models in which all low EFA pattern coefficients were fixed to zero fitted especially poorly. The authors conclude that it may be justified to use a less constrained model when testing a factor model by allowing some correlation among the factors and some of the lower factor pattern coefficients to differ from zero

Increased 18F-FDG-PET Uptake in Granulomatosis with Polyangiitis: Case Report and Review of the Literature

We present an unusual case of granulomatosis with polyangiitis (GPA), which initially presented as a large lung mass, without renal or other systemic features. The lung mass was most concerning for malignancy, and positron emission tomography (PET) further supported this concern, with intense uptake in the mass as well as in mediastinal and hilar lymph nodes. Biopsies however were non-diagnostic, and the patient developed acute kidney injury with active urinary sediment, leading to a definitive diagnosis of GPA. With supportive care and treatment directed at GPA, she was ultimately able to discontinue hemodialysis, and the lung mass resolved. This case demonstrates that GPA can present with PET-positive lymphadenopathy which may be initially suspected to be a malignancy, especially in the absence of renal abnormalities

Pijnmeting met de MPQ-DLV. Een kijkje in de data

Multivariate analysis of psychological data - ou

External analysis for three-mode principal component models

Datatheorie voor analyse van individuele verschille

Implicit theories of personality: Further evidence of extreme response style

Datatheorie voor analyse van individuele verschille