Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 20 for “"hurdle model"”.
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Investigaion of the Gamma Hurdle Model for a Single Population Mean
… nonnegative distributions would make sense to model but naturally zeroes will occur. One example of this is in the analysis of cost in insurance claim studies. One common approach to deal with the presence of zeroes is using a hurdle model. Most literary work on hurdle models will focus on …
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The economics of alcohol : a collection of essays
… different methods including the Tobit and Double-Hurdle models to estimate the mean price elasticity of demand for alcohol. In doing so, it tests how the price elasticity estimates can differ depending on model choice, even when the same data is used. Household expenditure data contains a large …
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Subsidies, aquaculture technology adoption, and welfare impacts in Ghana and Kenya
… this dissertation applies the lognormal double hurdle model to a cross-section of fish farms to analyze commercial demand for improved feed, and whether the government feed subsidy program influences private demand for the feed. The results indicate that households’ decisions to participate in …
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Bayesian methods for hurdle models.
Hurdle models are often presented as an alternative to zero-inflated models for count data with excess zeros. They consist of two parts: a binary model indicating a positive response (the "hurdle") and a zero-truncated count model. One or both parts of the model can depend on covariates, which may …
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Trait mindfulness as a predictive factor for intimate partner violence perpetration among young adults
… 247 undergraduate students, the study tested a hurdle model of IPV occurrence and frequency at Time 3 being predicted by trait mindfulness at Time 1 and other known risk factors at Time 2. Results indicated that trait mindfulness at time 1 was associated with IPV perpetration at Time 3; however, …
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Factors influencing adoption of minimum tillage ripping and animal draught power among smallholder farmers in Zambia
… had negative effects. The pooled triple hurdle model was less robust compared to the CRE triple hurdle model. All variables used in this analysis were found significant in determining the mean level of adoption on the hectares ripped. However, variables that were important for policy …
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Factors influencing adoption of minimum tillage ripping and animal draught power among smallholder farmers in Zambia
… had negative effects. The pooled triple hurdle model was less robust compared to the CRE triple hurdle model. All variables used in this analysis were found significant in determining the mean level of adoption on the hectares ripped. However, variables that were important for policy …
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Drivers of smallholder adoption and the intensity of conservation agriculture in the Masvingo District of Zimbabwe
… use and intensity were identified using a double hurdle model. Although most smallholders implemented the reduced tillage component of CA, only a few implemented all three components. Farm size and experience with CA technology impacted positively on the current use of CA. Distance from town …
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Patterns of tobacco consumption in Mexico – current perspective
… 2007, a source individual-level data. A two-part model of cigarette demand is estimated. According to the estimation, a number of significant effects are found to determine the overall level of consumption in both sweeps. In the third chapter a panel hurdle model is applied to data on cigarette …
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Exclusivity, Bundling and Switching in Communications Markets
… The study uses a novel application of a double-hurdle model to analyse a cross-sectional dataset of 187 countries featuring industry-speci�c and demographic variables drawn from both o�-the-shelf sources and from an analysis of several hundred individual sources of evidence. The results show …
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Driven to Care: A Society-Centric Analysis of Family Caregivers' Travel Behavior and its Determinents
… Care & Travel Time Budgets” employed a two-part hurdle model on the American Time Use Data to conduct a focused investigation on different care travel burdens by gender. Last but not least, the third chapter titled “Mobility of care and older adults: Travel facilitators and barriers for family …
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Modelling the range-wide density patterns of the Arthroleptella lightfooti using acoustic monitoring data
… present. The second stage consisted of fitting a Hurdle Model to the data where the presence data is modelled using logistic regression and the density data is separately modelled using ordinary linear regression. The third stage involved combining the two models to estimate the expected density …
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Effects of fire frequency and seasonality on the population dynamics of the critically endangered Clanwilliam cedar
… cedar count numbers I used a negative binomial hurdle model using seasonal fire indices and environmental data. To examine the impact of fire frequency and seasonality on the life-history of the Clanwilliam cedar, I used a stochastic demographic model based on parameter values obtained from the …
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Essays on Malawian agriculture: Micro-level welfare impacts of agricultural productivity; profitability of fertilizer use; and targeting of fertilizer subsidy programs
… production using fixed effects and multilevel models. The study finds that fertilizer use is generally unprofitable at prevailing market conditions when one assumes farmers incur positive transaction costs in the use of fertilizer. The main factor that drives low fertilizer profitability is low …
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Striped Bass and Summer Flounder Population Dynamics in the Chesapeake Bay: an Ecosystem Based Evaluation
… community has changed more recently. We used a hurdle model to standardize interannual abundance of fish species caught in the Chesapeake Bay from two sources of fishery-independent trawl survey data. This standardization process led to relative abundance indices for 58 late juvenile to adult …
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Essays on Smallholder Behavior in Response to Resource Challenges in Sub-Saharan Africa
This dissertation consists of three chapters that address two major resource challenges faced by smallholder farmers in Sub-Saharan Africa: (i) weather shocks and (ii) limited land access for agricultural production. The first chapter looks at how weather shocks affect millet production and millet …
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Children, investments in education and poverty in Malawi
… technique for the independent Double Hurdle model. The proposed decom- position is done at the aggregate and disaggregated levels. The aggregated decomposition allows us to isolate the expenditure differences into a part attributable to differences in characteristics and a part which …
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Empirical Essays on Migration and Remittances in Pakistan
… migration) using discrete choice models. The study begins by investigating migration as a whole and then looks at the more disaggregate choice. On the snapshot of migration as a whole we detect an intriguing size-composition effect on the household’s probability of migration: the …
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SUSTAINABILITY STRATEGIES AND GREENWASHING ALONG FOOD VALUE CHAINS: AN EMPIRICAL ANALYSIS OF THE DETERMINANTS
… for each chapter, and a different regression model was employed based on the characteristics and distribution of the dependent variables. The thesis demonstrates that a vast proportion of companies do not communicate any sustainability activity. Moreover, our findings suggest that highly …
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Design and Model-based Approaches for Estimating Abundance of American Horseshoe Crab
… design. In Chapter 1 of this work, I developed hurdle models for each of the six HSC demographic groups to standardize catch-per-unit-effort (CPUE) and estimate relative abundance using a model-based approach. It was determined that while the two approaches resulted in mostly convergent …