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Negli archivi amministrativi dell’INPS, e in particolare nei dati dell’Osservatorio delle Imprese, il settore di attività economica è identificato in base a diverse classificazioni. I dati più recenti riportano la codifica Ateco 2002, validata dall’ISTAT nell’ambito del progetto ASIA...
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L'aggancio tra i dati WHIP e quelli del Casellario degli Attivi consente l'osservazione di tutti i percorsi lavorativi, non solo quelli coperti dai dati INPS (o WHIP). Questa procedura ha permesso di dare una parziale risposta ad una domanda che ci si pone quando si usano i dati WHIP, o di fonte...
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In questo rapporto si presentano due informazioni sviluppate partendo dagli archivi degli episodi di lavoro dipendente di WHIP (archivi RL_annui_): gli oneri sociali obbligatori (variabile oneri_sociali) e il costo del lavoro (variabile costo_lavoro). Le stime degli oneri sociali obbligatori e...
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The paper explores the fit properties of a class of multivariate Lévy processes, which are characterized as time-changed correlated Brownian motions. The time-change has a common and an idiosyncratic component, to re ect the properties of trade, which it represents. The resulting process may...
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This paper constructs a class of multivariate Gaussian marked Poisson processes to model asset returns. The model proposed accommodates the cross section properties of trades, allows for returns to be correlated conditional on trading activity, and preserves the economic intuition of normality...
Persistent link: https://www.econbiz.de/10010941709
The traditional multivariate Lévy process constructed by subordinating a Brownian motion through a univariate subordinator presents a number of drawbacks, including the lack of independence and a limited range of dependence. In order to face these, we investigate multivariate subordination,...
Persistent link: https://www.econbiz.de/10005094047
Time-changed Brownian motions are extensively applied as mathematical models for asset returns in Finance. Time change is interpreted as a switch to trade-related business time, different from calendar time. Time-changed Brownian motions can be generated by infinite divisible normal mixtures....
Persistent link: https://www.econbiz.de/10005013920