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1
artículo
This methodological article explains a conceptual and practical approach to Structural Equation Models or Structural Equation Modeling (SEM). SEMs are considered among the most powerful tools for the study of causal relationships in non-experimental data. They are a combination of factor analysis and multiple regression and are composed of two components: the measurement model and the structural model. The measurement model describes the relationship between a series of observable variables; while in the structural model the relationships between variables are hypothesized; i.e., the relationships between latent variables are described with the use of arrows. Performing a SEM involves five stages: (1) A specification of the Model; (2) Identification of the Model; (3) Estimation of the Model; (4) Evaluation of the Model and (5) Re-specification of the Model. This article provides a series...
2
artículo
This methodological article explains a conceptual and practical approach to Structural Equation Models or Structural Equation Modeling (SEM). SEMs are considered among the most powerful tools for the study of causal relationships in non-experimental data. They are a combination of factor analysis and multiple regression and are composed of two components: the measurement model and the structural model. The measurement model describes the relationship between a series of observable variables; while in the structural model the relationships between variables are hypothesized; i.e., the relationships between latent variables are described with the use of arrows. Performing a SEM involves five stages: (1) A specification of the Model; (2) Identification of the Model; (3) Estimation of the Model; (4) Evaluation of the Model and (5) Re-specification of the Model. This article provides a series...
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The aim of this work was to propose a latent equation model that structures the relationship between academic engagement, schadenfreude and prosocial behavior on the school climate. We used a cross-sectional design and 437 secondary students from Chile were recruited. School Climate Scale, Engagement UWES-S 9, School Prosocial Behavior Inventory and Schadenfreude scale were administered. Factor analysis, reliability test, correlation analysis and structural equation modeling were performed to analysis data. After fitting two models for our data and contrasting them with theoretical literature, we found that school climate was affected directly by school engagement and prosocial behavior. Academic engagement positive affects, direct and indirectly, the school climate. An increase in academic engagement also lowers the levels of schadenfreude and causes an increase in the levels of pr...
4
artículo
Publicado 2025
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Introduction: The evaluation of the homeostatic model gives results close to the gold standard (hyperinsulinemic-euglycemic clamp). Objective: To develop an equation to determine the homeostatic model of insulin resistance. Material and methods: Analytical and cross-sectional study of secondary databases of 2004 Venezuelan adults and another of 4363 Mexicans. The variables were: homeostatic model of insulin resistance (HOMA-2), basal insulin, basal glucose. Multiple linear regression, scatter plot, and student t test were used. Results: The regression equation was -0.694+(0.138*basal insulin)+(0.009*basal glucose), where HOMA2-IR increases 0.138 for each U/mL of insulin and increases 0.009 for each mg/dL of basal glucose. The R2 value was 0.983 (Venezuelan database), indicating that 98% of the change in HOMA2-IR can be explained by the model based on basal insulin and glucose. The equati...
5
artículo
Publicado 2024
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The objective of this study is to identify factors influencing product purchase choices in the sample market of Chachapoyas using structural equation modeling (SEM) using AMOS v.24 software. The sample of 384 customers was composed mostly of women (60%) and young people aged 18 to 30 years (55%), and it was found that personal characteristics such as age, lifestyle and financial situation influenced purchase decisions. The results showed that cultural, social and psychological factors did not have a significant effect. The usefulness of SEM for studying the interaction between multiple variables and validating theoretical models in non-experimental settings was confirmed. These findings underscored the importance of considering personal factors in marketing and business strategies in local market settings. The conclusion is that understanding individual characteristics is important for u...
6
artículo
Publicado 2022
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This study proposes a model to improve identity registration service and correlates this service to the process quality and technology by means of structural equations using SPSS and AMOS. To reinforce the analysis of the information obtained from documents and records of the processes of identity registration, a 21 question survey was given to citizens coming to 1 of 16 regional headquarters, from which it was possible to demonstrate through structural equations, the existence of a strong relationship between the three variables: process quality, technology and service improvement.
7
artículo
Publicado 2021
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The purpose of the study is to measure the adjustment of an explanatory model of student performance in the subject of General Statistics at the La Molina National Agrarian University (UNALM) through the statistical technique of Structural Equation Models. The proposed model considers four factors: student performance, teacher performance, personal perception, and past performance. Two assessment instruments are applied in the study, first to measure personal perception, and the second, is to measure teacher performance. Cronbach's Alpha Reliability Coefficient is used to verify the reliability requirement and the Confirmatory Factor Analysis to verify the validity requirement of the assessment instruments. In both assessment instruments indicators obtain to confirm their reliability and validity. The fit of the proposed model was verified using the goodness of fit indicators, finding th...
8
artículo
Publicado 2017
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In this article, we formulate a physiological process through a two-dimensional fluid-structure interaction problem between the airflow and the pulmonary alveolus in the Eulerian-Lagrangian Arbitrary (ALE) frame.This problem arises by coupling the equations of the fluid and the structure, described by the Navier-Stokes equations of evolution for incompressible flows, and an equilibrium equation, respectively.
9
artículo
Publicado 2017
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In this article, we formulate a physiological process through a two-dimensional fluid-structure interaction problem between the airflow and the pulmonary alveolus in the Eulerian-Lagrangian Arbitrary (ALE) frame.This problem arises by coupling the equations of the fluid and the structure, described by the Navier-Stokes equations of evolution for incompressible flows, and an equilibrium equation, respectively.
10
artículo
Publicado 2019
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The purpose was to analyze how the transfer of knowledge is managed in an institution of higher education by analyzing a model of structural equations. The research was conducted on the basis proposed by Molina and Marsal (2002) model, analyzing the implication of the high direction, organizational culture, management skills, technology, knowledge management processes and indicators. The questionnaire consisted of 34 questions in Likert scale. Cronbach’s alpha coefficient obtained for the six variables was .948. It was noted that managers integrate and support knowledge management; participants are considered responsible for their own information. The influence of the observed variables in the variable under study was identified through analysis of a structural equation model.
11
artículo
Publicado 2017
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In the present work, a Basic Model SI with Vital Dynamics Structured by Gender developed by the Ordinary Differential Equations (Transmission of contagion is instantaneous), and also developed in the DelayDifferential Equations (Transmission of contagion occurs after a certain period of time), where the Local and Asymptotic Stability Theorem is proposed The Free of Infection point for both models, respectively.
12
artículo
Publicado 2017
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In the present work, a Basic Model SI with Vital Dynamics Structured by Gender developed by the Ordinary Differential Equations (Transmission of contagion is instantaneous), and also developed in the DelayDifferential Equations (Transmission of contagion occurs after a certain period of time), where the Local and Asymptotic Stability Theorem is proposed The Free of Infection point for both models, respectively.
13
artículo
Publicado 2018
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Numerous studies have assessed the benefits of cleaner production on business performance but have not yet reached conclusive results. This investigation is an attempt to make two contributions to business management. Firstly, various types of cleaner production activities are compared, as well as hard and soft kills. Secondly, this study complements existing literature that focuses on Peruvian copper mining industry. Additionally, the relationship between cleaner production and business performance was evaluated using Structural Equation Modelling (SEM). An overall positive impact of cleaner production on business performance was found. On the other hand, it was also found that high-cost cleaner production activities have a bigger contribution to financial performance compared to non-financial performance, whereas low-cost cleaner production activities have a greater contribution to non...
14
artículo
Publicado 2025
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Personality tests are used regularly as a requirement within many sectors in Brazil, including education, human resources, and transportation. The Personality Factor Inventory, based on Murray’s system of needs theory, is one of the widely used tools within Brazil. Despite its importance, its results are only partially related to the Big Five theory, which is the predominant framework for understanding personality. This theoretical divergence poses practical challenges for professionals who rely on or are required to work within the Big Five model. Harmonizing these two theories could enhance their practical utility. In this study, we evaluate the possibility of fitting Murray’s personality theory within the Big Five framework using Exploratory Structural Equation Modeling and invariance tests (i.e., gender) using data from 272 845 participants in Brazil (56.2% men, M age 21.74 ± 15...
15
artículo
Publicado 2016
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Research has developed a methodology to measure the quality and develop a model of service quality using structural equations. The research was applied at the student’s cafeteria of San Marcos University. The methodology is to develop a survey technique according to SERVQUAL of 22 questions and apply them to a representative sample. Following the exploratory factor analysis (AFE) in order to determine the dimensions of service quality is made, then confirmatory factor analysis (AFC) is applied in order to quantify the relationships between variables and dimensions; and finally, is performed the structural equation model (MEE) to find out the relationship between the dimensions, which is the model of service quality. To prepare the AFE the Lisrel and SPSS software were used; and for AFC and MEE the Lisrel software was used.
16
artículo
Publicado 2025
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This study investigates market dynamics using a discrete economic model of supply and demand. Initially, the linear case with naïve or static expectations is analyzed, and the stability conditions that lead to different system behaviors, such as convergence to equilibrium, periodic oscillations, or divergence, are determined analytically through the study of fixed points and cobweb dynamics. Subsequently, the analysis is extended to the nonlinear case with adaptive expectations, where the interaction between supply nonlinearity and the expectation formation process is found to generate complex behaviors. The results show how variations in the nonlinearity parameter induce bifurcations observable in time series. The study provides a comprehensive analytical framework that links mathematical properties with observable economic phenomena, offering tools to predict and manage stability in r...
17
artículo
Publicado 2020
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In this work, we analyze the stability of two epidemiological models of obesity. The first model only admits social influence, that is, the environment in which individuals live, the second model adds control to reduce obesity and excess weight. The obesity-free equilibrium point is local and asymptotically stable if R0 < 1 where R0 is a basic replacement rate. For the model with control, its stability is shown and it is appreciated numerically that it accelerates the decrease of obese individuals.
18
artículo
Publicado 2020
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In this work, we analyze the stability of two epidemiological models of obesity. The first model only admits social influence, that is, the environment in which individuals live, the second model adds control to reduce obesity and excess weight. The obesity-free equilibrium point is local and asymptotically stable if R0 < 1 where R0 is a basic replacement rate. For the model with control, its stability is shown and it is appreciated numerically that it accelerates the decrease of obese individuals.
19
artículo
Publicado 2017
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We simulated the dynamics of CO2 transport in the alveolar sacs of the human lung. Using Arbitrary Lagrangian Eulerian (ALE) framework, we control the movement domain for a normal and fast maneuver. The fluid of room air inspired and CO2 concentrations were approximated by Navier-Stokes and convection diffusion equations; the stress-stretch in the wall for different volumes were quantified in equal time of respiration. The expansion for a normal and forced maneuver were represented as 9 and 90% to the initial geometry. The difference of the CO2 was 73x10
20
artículo
Publicado 2017
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We simulated the dynamics of CO2 transport in the alveolar sacs of the human lung. Using Arbitrary Lagrangian Eulerian (ALE) framework, we control the movement domain for a normal and fast maneuver. The fluid of room air inspired and CO2 concentrations were approximated by Navier-Stokes and convection diffusion equations; the stress-stretch in the wall for different volumes were quantified in equal time of respiration. The expansion for a normal and forced maneuver were represented as 9 and 90% to the initial geometry. The difference of the CO2 was 73x10
