1,721,188 research outputs found
Thrombophilia as a predictor of persistent residual vein thrombosis
No full textHaematologica. 2008 Mar;93(3):479-80.
Thrombophilia as a predictor of persistent residual vein thrombosis.
Spiezia L, Tormene D, Pesavento R, Salmaso L, Simioni P, Prandoni P.
To compare the probability of leg vein recanalization between carriers and
non-carriers of thrombophilia after an episode of deep vein thrombosis (DVT) of
the lower extremities, we reviewed the clinical records of 472 patients with
proximal DVT who were diagnosed with thrombophilia, and had long-term ultrasound
scanning. One hundred and thirty-seven patients (29.0%) were carriers of
thrombophilia. After adjusting for age, sex, DVT localization and modality of
presentation, the hazard ratio of vein recanalization in thrombophilic compared
with non-thrombophilic patients was 0.49 (95% CI, 0.38 to 0.63). These findings
suggest that thrombophilia is an independent predictor of persistent residual
vein thrombosis.
PMID: 18310547 [PubMed - indexed for MEDLINE
Multivariate Bi-Aspect Testing for the Two-Sample Location Problem
No full textThe multivariate extension of the bi-aspect nonparametric testing procedure for the two-sample location problem presented in Marozzi (2004) is discussed. Two solutions are presented: the former is focused on each variable, the latter is focused on each of the two aspects involved in the bi-aspect (the categorical and the numerical one). Formal proofs of exactness, unbiasedness, and consistency of the multivariate tests are given. Such properties hold even when population first and second moments do not exist
Comparative evaluation of external effectiveness of two university faculties through nonparametric heterogeneity tests
No full textIn some University evaluation problems it can be useful to establish if a categorical variable is more concentrated in a population rather than in another one. For instance the so-called “external effectiveness” of two different Faculties can be evaluated comparing the heterogeneities of the sets of job opportunities. Faculties which offer a more heterogeneous set of job opportunities can be considered more effective. In the present work we propose a nonparametric heterogeneity test, whose test statictic is based on the difference of two sampling heterogeneity indexes
Coltivazioni, allevamenti e aziende agricole
No full textIl contributo è dedicato alla descrizione delle peculiarità strutturali delle aziende agricole del territorio ferrarese, con alcuni cenni agli apetti del lavoro e della meccanizzazione. Ulteriori approfondimenti riguardano le caratteristiche principali delle coltivazioni e degli allevamenti. Il riferimento temporale è l'anno 2000; in molti casi per effettuare valutazioni sull'evoluzione in corso, sono stati fatti dei raffronti con la situazione al 1990.
L'ambito territoriale considerato comprende l'area provinciale, le province dell'Emilia Romagna e le province limitrofe di Mantova e Rovigo.
Con riferimento alle fonti utilizzate, i dati reltivi alle province dell'Emilia Romagna e dell'Area Vasta sono stati derivati dai censimenti ISTAT dell'Agricoltura del 1990 e del 2000
Repeated Measures Designs: a Permutation Approach for Testing for Active Effects
No full textIn this paper we present some extensions of the synchronized permutation solution for testing for active effects in two-way ANOVA designs (F. Pesarin [Multivariate Permutation Tests with Applications in Biostatistics, John Wiley, Chichester, 2001] and L. Salmaso [Comm. Statist. Theory Methods 32 (2003), 1419-1437]). Such solutions are related to balanced and unbalanced repeated measures designs based on I*J ANOVA designs. Furthermore a simulation study to evaluate the performance of partial tests for testing for effects in a 3*3 design is also presented
Il turismo nella provincia di Ferrara: analisi della struttura ricettiva e dei movimenti turistici.
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Qualità dei servizi e disomogeneità di prestazioni: procedure inferenziali per valutazioni comparative
No full textIn questo lavoro presentiamo un approccio non parametrico per il
problema di verifica di ipotesi in cui vengono confrontate le eterogeneità di due popolazioni indipendenti in riferimento ad una variabile qualitativa (es. giudizi di qualità), per stabilire se una è maggiore dell’altra. Lo studio di simulazione condotto attesta il buon comportamento in potenza del test proposto
Indagine conoscitiva sulle condizioni di lavoro e le pari opportunità nell'Università di Ferrara
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