Search results for "Mixture model"
showing 10 items of 86 documents
Unbundling technology adoption and tfp at the firm level. Do intangibles matter?
2012
We use a panel of European firms to investigate the relationship between intangible assets and productivity. We distinguish between total factor productivity (tfp) and technology adoption, whereas standard estimations consider only a notion of productivity that conflates the two effects. Although we are unable to address simultaneity, we allow for the existence of multiple technologies within sectors through a mixture model approach. We find that intangible assets have nonnegligible effects that both push firms toward better technologies (technology adoption effects) and allow for more efficient exploitation of a given technology (tfp effects).
A Mixture Multiplicative Error Model for Realized Volatility
2006
A multiplicative error model with time-varying parameters and an error term following a mixture of gamma distributions is introduced. The model is fitted to the daily realized volatility series of deutschemark/dollar and yen/dollar returns and is shown to capture the conditional distribution of these variables better than the commonly used autoregressive fractionally integrated moving average model. The forecasting performance of the new model is found to be, in general, superior to that of the set of volatility models recently considered by Andersen et al. (2003, Econometrica 71, 579--625) for the same data. Copyright 2006, Oxford University Press.
Maternal teaching of reading and children's reading skills in Grade 1: Patterns and predictors of positive and negative associations
2013
Abstract The main aim of the study was to identify subgroups of children based on the associations between the reported frequency of maternal teaching of reading and children's reading skills, and whether these subgroups differ with respect to mother-related (i.e., education, controlling behavior, and emotions in homework situations) and child-related (i.e., reading habits and gender) background factors. Data were gathered from 1460 mother–child dyads. The reading skills of 6- to 7-year-old Finnish-speaking children were measured at the beginning and at the end of Grade 1. Information from mothers was gathered by questionnaires. Regression Mixture Modeling identified four latent subgroups o…
Development of need for recovery from work over one year: A person-centered approach
2011
This longitudinal questionnaire study conducted among 274 Finnish employees (57% women, average age 45.9 years) in a variety of jobs aimed at identifying groups of employees who share similar mean levels and changes in need for recovery and finding out whether factors regarded as antecedents of need for recovery distinguish between the different groups of need for recovery across one year. Using mixture modeling eight groups of need for recovery were identified. The individuals identified as closely resembling each other with respect to need for recovery and its change across one year were considered to belong to the same need for recovery group. Five of these groups indicated stable (low, …
Linear spectral mixture modelling to estimate vegetation amount from optical spectral data
1996
Abstract Spectral mixture modelling has developed in recent years as a suitable remote sensing tool for analysing the biophysical and compositional character of ground surfaces. In this paper the potentiality of the linear spectral mixture model to extract vegetation related parameters from 0·4-2·5 μm reflectance data has been tested. High spectral resolution reflectance measurements of soil-plant mixtures with different soil colour and plant densities were carried out in a laboratory experiment. The constrained least-squares and the factor analysis unmixing procedures were applied to generate endmember fractions of the components present in the mixtures and to test the validity of the mode…
Environmental Quality and Entrepreneurial Activity in Rural Tourism in Italy
2012
We estimate the relation between environmental quality and services in rural tourism in Italy. We use the average number of firms per region in 2003-07 to indicate entrepreneurial activity. We suggest that heterogeneity among administrative regions can be tied to environmental quality. Incorporated farms in rural tourism are relatively more common in regions with better environmental quality, and command higher average price from better quality in hospitality. Only 7% of entrepreneurial activity can be attributable to environmental quality. We conclude that rural tourism activity in Italy is not genuinely tied to environmental quality.
Labor productivity and firm-level TFP with technology-specific production functions
2020
Abstract We investigate the technological dimension of productivity, presenting an empirical methodology based on mixture models to disentangle the labor productivity differences associated with the firm's choice of technology (BTFP) and those related to the firm's ability to exploit the adopted technology (WTFP). The estimation endogenously determines the number of technologies (in the sector) and degree of technology sharing across firms (i.e., for each firm, the probability of using a given technology). By using comparable data for about 35,000 firms worldwide distributed across 22 (two-digit) sectors, we show BTFP to be at least as important as WTFP in explaining the labor productivity …
Latent segmentation in business-to-business based on information and communication technology and relationship variables
2016
Our work is focused on the segmentation analysis in the Spanish tourist industry. Using a sample of travel agencies who evaluated the relationship with their main supplier (relationship value, relationship benefits and perceived information and communication technologies (ICTs) use), we attempt to examine the utility of these variables as specific and subjective segmentation criteria for identifying heterogeneous groups. The estimation of a finite mixture model suggests that these bases are able to discriminate firms into six latent classes with different levels of ICT use and relationship variables. The novelty in this work lies in the application of latent segmentation methodology and th…
Happy Spouses, Happy Parents? Family Relationships Among Finnish and Dutch Dual Earners
2010
Contains fulltext : 90432.pdf (Publisher’s version ) (Closed access) In this study links between spousal and parent-child relationships among Finnish (n = 157 couples) and Dutch (n = 276 couples) dual earners with young children were examined using paired questionnaire data. Variable-oriented analyses (structural equation modeling with a multigroup procedure) supported the spillover hypothesis, as higher levels of satisfaction in the spousal relationship were related to higher quality in the parent-child relationship and lower parental role restrictions. These connections did not differ by gender or country. With family typological analyses (mixture modeling), 4 family types were identified…
Trajectories of life satisfaction and the financial situation in the transition to adulthood
2013
The aims of this study were (1) to investigate young adults’ life satisfaction changes during the transition to adulthood, (2) to identify possible life satisfaction developmental trajectories during the transition, and (3) to examine how individuals’ agency and personal financial situations are related to the identified life satisfaction trajectories in the contexts of life-span and life course theories of development. The present study is part of the longitudinal Finnish Educational Transitions (FinEdu) study, in which a total of 372 (278 female and 94 male) young adults filled in questionnaires at four measurement points, that is, twice before (at 18 and 19 years of age) and twice after…