Search results for "models"

showing 10 items of 8211 documents

Prognostic value of HSP27 in head and neck squamous cell carcinoma: a retrospective analysis of 57 tumours.

2006

Background: The aims of the present study were to assess the prevalence of HSP27 expression in oral squamous cell carcinoma (OSCC) and to verify whether HSP27 can be considered to be a marker of prognosis in patients with OSCC. Materials and Methods: The immunohistochemical expression of HSP27 was evaluated in 57 OSCC, who received standard treatment and monitoring. After grouping for HSP27 expression, OSCCs were statistically analysed for the variables age, gender, histological grading, TNM, staging and survival rate. Univariate and multivariate analyses were performed. Results: HSP27 was found to be reduced in 31 OSCC and was normally expressed in 26 OSCC. The pattern and intensity of HSP…

squamous cell carcinomaAdultAged 80 and overMaleAdolescentHSP27Middle AgedPrognosissurvivalImmunohistochemistrySurvival RateLogistic ModelsHead and Neck NeoplasmsCarcinoma Squamous CellHumanshead and neck cancerFemaleHeat-Shock ProteinsAgedNeoplasm StagingRetrospective StudiesAnticancer research

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SNP and SML estimation of univariate and bivariate binary–choice models

2008

We discuss the semi-nonparametric approach of Gallant and Nychka (1987, Econometrica 55: 363–390), the semiparametric maximum likelihood approach of Klein and Spady (1993, Econometrica 61: 387–421), and a set of new Stata commands for semiparametric estimation of three binary-choice models. The first is a univariate model, while the second and the third are bivariate models without and with sample selection, respectively. The proposed estimators are root-n consistent and asymptotically normal for the model parameters of interest under weak assumptions on the distribution of the underlying error terms. Our Monte Carlo simulations suggest that the efficiency losses of the semi-nonparametric a…

st0000 snp snp2 snp2s sml sml2s binary-choice models seminonparametric approach SNP estimation semiparametric maximum likelihood SML estimation Monte Carlo simulationSettore SECS-P/05 - EconometriaSettore SECS-P/01 - Economia Politica

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Il dynamic business model: una prospettiva dinamica per la progettazione dei modelli di business

2017

Building on the extant literature on business modelling and focussing on start-up firms, this article aims at exploring the combination between conventional business model schemes and System Dynamics methodology with the intent to overcome those limitations related to a static design approach. By mapping the multiple key elements underlying value creation processes – linked according to a cause-and-effect perspective – and with the support of a simulation-based methodology, entrepreneurs may experiment and understand how the firm reacts to strategic and organizational changes in terms of performance, innovation and value creation.

start-upSettore SECS-P/07 - Economia Aziendalebusiness models system dynamics start-upmodelli di businessmodelli di business; system dynamics; start-upsystem dynamics

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2004

communication oraleFR2116communication orale

stomatognathic diseasesInformationSystems_MODELSANDPRINCIPLESComputingMilieux_THECOMPUTINGPROFESSIONGeneralLiterature_INTRODUCTORYANDSURVEYComputingMilieux_COMPUTERSANDEDUCATION[ SDU.ENVI ] Sciences of the Universe [physics]/Continental interfaces environment[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment[SDU.ENVI] Sciences of the Universe [physics]/Continental interfaces environment

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