scholarly journals Specifikusság, mint migrációs ellenösztönző: elmélet és egy rendezett logit modell tanulságai = Specificity as counterincentive of migration: theoretical approach and the teaching of an ordered logit model

2021 ◽  
Vol 16 (1) ◽  
pp. 103-116
Author(s):  
József Golovics

Jelen tanulmányban a nemzetközi migráció hagyományos mikroökonómiai elméletét bővítjük ki a Williamson-féle specifikusság koncepciójával. Amellett érvelünk, hogy bizonyos hely- és kapcsolatspecifikus beruházások megléte komoly ellenösztönzőként szolgálhat az elvándorlásra. A specifikusság fogalmával így a korábbi gazdasági megközelítések horizontján kívül eső empirikus megfigyeléseket is magyarázni tudjuk, emellett pedig bizonyos, a migráció közgazdaságtani modelljeiben meglévő tényezőket helyezünk új megvilágításba. Feltevéseinket egy elméleti keretben vázoljuk fel, majd egyéni szintű migrációs potenciálra vonatkozó Eurobarometer adatok és egy rendezett logit modell segítségével empirikusan is teszteljük őket. This paper integrates Williamson’s concept of specificity into the neoclassical microeconomic theory of international migration. It is claimed that certain site specific and relationship specific investments may be substantial disincentives to migrate. Thus, the concept of specificity can interpret several empirical findings that remained unexplained in former economic models. Besides, it can shed a new light on standard factors of these models as well. These claims are outlined in a theoretical framework and tested empirically by using individual Eurobarometer migration intention data and an ordered logit model.

2018 ◽  
Vol 33 ◽  
pp. 147-154 ◽  
Author(s):  
Maria Grazia Bellizzi ◽  
Laura Eboli ◽  
Carmen Forciniti ◽  
Gabriella Mazzulla

Author(s):  
Qiang Zeng ◽  
Wei Hao ◽  
Jaeyoung Lee ◽  
Feng Chen

This study presents an empirical investigation of the impacts of real-time weather conditions on the freeway crash severity. A Bayesian spatial generalized ordered logit model was developed for modeling the crash severity using the hourly wind speed, air temperature, precipitation, visibility, and humidity, as well as other observed factors. A total of 1424 crash records from Kaiyang Freeway, China in 2014 and 2015 were collected for the investigation. The proposed model can simultaneously accommodate the ordered nature in severity levels and spatial correlation across adjacent crashes. Its strength is demonstrated by the existence of significant spatial correlation and its better model fit and more reasonable estimation results than the counterparts of a generalized ordered logit model. The estimation results show that an increase in the precipitation is associated with decreases in the probabilities of light and severe crashes, and an increase in the probability of medium crashes. Additionally, driver type, vehicle type, vehicle registered province, crash time, crash type, response time of emergency medical service, and horizontal curvature and vertical grade of the crash location, were also found to have significant effects on the crash severity. To alleviate the severity levels of crashes on rainy days, some engineering countermeasures are suggested, in addition to the implemented strategies.


2010 ◽  
Vol 27 (5) ◽  
pp. 831-846 ◽  
Author(s):  
Dennis Fok ◽  
Richard Paap ◽  
Bram Van Dijk

Author(s):  
Özge Akkuş ◽  
Volkan Sevinç

This article aims to introduce the use of ordered logit model with time series data in milk productivity studies and determine the important factor levels affecting the milk yield of Holstein Friesians. The data consists of 2002 records collected for the years 2009-2015 from the reports of the Cattle Breeders’ Association of Turkey (CBAT) in Muðla province in Turkey. The direct and marginal effects of the variables: parity, lactation length and year of calving on milk yield are investigated and the probabilities regarding the milk yield production for a given specific parity, lactation length and calving year are calculated. The results show that milk yield slightly increases on the 4th parity of cows. As far as the years concerned, although there had mostly been a steady amount of milk production between 2009 and 2015 years, there was a significant decrease in 2011 and increase in 2014.


2017 ◽  
Vol 29 (4) ◽  
pp. 421-426
Author(s):  
Se-Hyuk Kim ◽  
◽  
Cheong-Ryong Lim ◽  
Hang-Ah Lee ◽  
Yun-Mi Oh ◽  
...  

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