This paper discusses dynamic factor analysis, a technique for estimating common trends in multivariate time series. Unlike more common time series techniques such as spectral analysis and ARIMA models, dynamic factor analysis can analyse short, non-stationary time series containing missing values. Typically, the parameters in dynamic factor analysis are estimated by direct optimisation, which m...

the performance of dual-layer multiple tuned mass dampers (dl-mtmd) with uniformly distributed natural frequencies is investigated. the dl-mtmd consists of one large tuned mass damper (l-tmd) and an arbitrary number of small tuned mass dampers (s-tmd). the primary structure is represented as a single degree-of-freedom system which corresponds to a specific vibration mode to be controlled in a r...

the rural tourism as the most popular forms of tourism can be regarded as a policy to reduce the problems of rural areas. rural tourism, is a risk factor for the development of rural areas, including most the effects of its population stable, solve unemployment, reduced migration and more. this study aimed to detection effects of tourism in myshkhas rural center development in ilam province. a ...

objective: the aim of this study is to explore the confirmatory factor analysis results of the persian adaptation of statistics anxiety measure (sam), proposed by earp. method: the validity and reliability assessments of the scale were performed on 298 college students chosen randomly from tabriz university in iran. confirmatory factor analysis (cfa) was carried out to determine the factor stru...

designing breeding programs for winter rapeseed (brassica napus l.) cultivars with improved seed and oil yields requires information about the genetic variability of traits. in this study, 28 winter rapeseed cultivars were evaluated for genetic variation and relationships between 11 agro-morphological characters during 2010 and 2011. cultivars and cultivar × year interaction showed significant ...

this study concerns determining the factors that may influence the communication skill of those university teachers involved in the field of agricultural sciences in iran. accordingly, based on a cross-sectional survey method, a conceptual model of communication skill has been devised through reviewing the related literature. next, the model was revised by the expert panel of the study into a s...

during ramadan fasting quantity and quality of dietary intake may change. there was no data on nutrient patterns in ramadan fasting. the purpose of this study was to identify ramadan major nutrient patterns among those who fast in tehran, iran. 510 fasting people aged 18-65 years and bmi 18.5-40 kg/m2 were recruited in our study by 2-stage cluster sampling method in june-july 2014. data on the ...