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Articles 1291 - 1320 of 16269
Full-Text Articles in Social and Behavioral Sciences
On Some Discrete Distributions And Their Applications With Real Life Data, Shipra Banik, B. M. Golam Kibria
On Some Discrete Distributions And Their Applications With Real Life Data, Shipra Banik, B. M. Golam Kibria
Journal of Modern Applied Statistical Methods
This article reviews some useful discrete models and compares their performance in terms of the high frequency of zeroes, which is observed in many discrete data (e.g., motor crash, earthquake, strike data, etc.). A simulation study is conducted to determine how commonly used discrete models (such as the binomial, Poisson, negative binomial, zero-inflated and zero-truncated models) behave if excess zeroes are present in the data. Results indicate that the negative binomial model and the ZIP model are better able to capture the effect of excess zeroes. Some real-life environmental data are used to illustrate the performance of the proposed models.
Relationship Between Internal Consistency And Goodness Of Fit Maximum Likelihood Factor Analysis With Varimax Rotation, Gibbs Y. Kanyongo, James B. Schreiber
Relationship Between Internal Consistency And Goodness Of Fit Maximum Likelihood Factor Analysis With Varimax Rotation, Gibbs Y. Kanyongo, James B. Schreiber
Journal of Modern Applied Statistical Methods
This study investigates how reliability (internal consistency) affects model-fitting in maximum likelihood exploratory factor analysis (EFA). This was accomplished through an examination of goodness of fit indices between the population and the sample matrices. Monte Carlo simulations were performed to create pseudo-populations with known parameters. Results indicated that the higher the internal consistency the worse the fit. It is postulated that the observations are similar to those from structural equation modeling where a good fit with low correlations can be observed and also the reverse with higher item correlations.
Estimating Model Complexity Of Feed-Forward Neural Networks, Douglas Landsittel
Estimating Model Complexity Of Feed-Forward Neural Networks, Douglas Landsittel
Journal of Modern Applied Statistical Methods
In a previous simulation study, the complexity of neural networks for limited cases of binary and normally-distributed variables based the null distribution of the likelihood ratio statistic and the corresponding chi-square distribution was characterized. This study expands on those results and presents a more general formulation for calculating degrees of freedom.
Detecting Lag-One Autocorrelation In Interrupted Time Series Experiments With Small Datasets, Clare Riviello, S. Natasha Beretvas
Detecting Lag-One Autocorrelation In Interrupted Time Series Experiments With Small Datasets, Clare Riviello, S. Natasha Beretvas
Journal of Modern Applied Statistical Methods
The power and type I error rates of eight indices for lag-one autocorrelation detection were assessed for interrupted time series experiments (ITSEs) with small numbers of data points. Performance of Huitema and McKean’s (2000) zHM statistic was modified and compared with the zHM, five information criteria and the Durbin-Watson statistic.
Closed Form Confidence Intervals For Small Sample Matched Proportions, James F. Reed Iii
Closed Form Confidence Intervals For Small Sample Matched Proportions, James F. Reed Iii
Journal of Modern Applied Statistical Methods
The behavior of the Wald-z, Wald-c, Quesenberry-Hurst, Wald-m and Agresti-Min methods was investigated for matched proportions confidence intervals. It was concluded that given the widespread use of the repeated-measure design, pretest-posttest design, matched-pairs design, and cross-over design, the textbook Wald-z method should be abandoned in favor of the Agresti-Min alternative.
Confidence Interval Estimation For Intraclass Correlation Coefficient Under Unequal Family Sizes, Madhusudan Bhandary, Koji Fujiwara
Confidence Interval Estimation For Intraclass Correlation Coefficient Under Unequal Family Sizes, Madhusudan Bhandary, Koji Fujiwara
Journal of Modern Applied Statistical Methods
Confidence intervals (based on the χ2 -distribution and (Z) standard normal distribution) for the intraclass correlation coefficient under unequal family sizes based on a single multinormal sample have been proposed. It has been found that the confidence interval based on the χ2 -distribution consistently and reliably produces better results in terms of shorter average interval length than the confidence interval based on the standard normal distribution: especially for larger sample sizes for various intraclass correlation coefficient values. The coverage probability of the interval based on the χ2 -distribution is competitive with the coverage probability of the interval …
Approximate Bayesian Confidence Intervals For The Mean Of A Gaussian Distribution Versus Bayesian Models, Vincent A. R. Camara
Approximate Bayesian Confidence Intervals For The Mean Of A Gaussian Distribution Versus Bayesian Models, Vincent A. R. Camara
Journal of Modern Applied Statistical Methods
This study obtained and compared confidence intervals for the mean of a Gaussian distribution. Considering the square error and the Higgins-Tsokos loss functions, approximate Bayesian confidence intervals for the mean of a normal population are derived. Using normal data and SAS software, the obtained approximate Bayesian confidence intervals were compared to a published Bayesian model. Whereas the published Bayesian method is sensitive to the choice of the hyper-parameters and does not always yield the best confidence intervals, it is shown that the proposed approximate Bayesian approach relies only on the observations and often performs better.
Semi-Parametric Of Sample Selection Model Using Fuzzy Concepts, L. Muhamad Safiih, A. A. Kamil, M. T. Abu Osman
Semi-Parametric Of Sample Selection Model Using Fuzzy Concepts, L. Muhamad Safiih, A. A. Kamil, M. T. Abu Osman
Journal of Modern Applied Statistical Methods
The sample selection model has been studied in the context of semi-parametric methods. With the deficiencies of the parametric model, such as inconsistent estimators, semi-parametric estimation methods provide better alternatives. This article focuses on the context of fuzzy concepts as a hybrid to the semiparametric sample selection model. The better approach when confronted with uncertainty and ambiguity is to use the tools provided by the theory of fuzzy sets, which are appropriate for modeling vague concepts. A fuzzy membership function for solving uncertainty data of a semi-parametric sample selection model is introduced as a solution to the problem.
On Type-Ii Progressively Hybrid Censoring, Debasis Kundu, Avijit Joarder, Hare Krishna
On Type-Ii Progressively Hybrid Censoring, Debasis Kundu, Avijit Joarder, Hare Krishna
Journal of Modern Applied Statistical Methods
The progressive Type-II censoring scheme has become quite popular. A drawback of a progressive censoring scheme is that the length of the experiment can be very large if the items are highly reliable. Recently, Kundu and Joarder (2006) introduced the Type-II progressively hybrid censored scheme and analyzed the data assuming that the lifetimes of the items are exponentially distributed. This article presents the analysis of Type-II progressively hybrid censored data when the lifetime distributions of the items follow Weibull distributions. Maximum likelihood estimators and approximate maximum likelihood estimators are developed for estimating the unknown parameters. Asymptotic confidence intervals based on …
Performance Ratings Of An Autocovariance Base Estimator (Abe) In The Estimation Of Garch Model Parameters When The Normality Assumption Is Invalid, Daniel Eni
Journal of Modern Applied Statistical Methods
The performance of an autocovariance base estimator (ABE) for GARCH models against that of the maximum likelihood estimator (MLE) if a distribution assumption is wrongly specified as normal was studied. This was accomplished by simulating time series data that fits a GARCH model using the Log normal and t-distributions with degrees of freedom of 5, 10 and 15. The simulated time series was considered as the true probability distribution, but normality was assumed in the process of parameter estimations. To track consistency, sample sizes of 200, 500, 1,000 and 1,200 were employed. The two methods were then used to analyze …
Bayesian Analysis Of Evidence From Studies Of Warfarin V Aspirin For Symptomatic Intracranial Stenosis, Vicki Hertzberg, Barney Stern, Karen Johnston
Bayesian Analysis Of Evidence From Studies Of Warfarin V Aspirin For Symptomatic Intracranial Stenosis, Vicki Hertzberg, Barney Stern, Karen Johnston
Journal of Modern Applied Statistical Methods
Bayesian analyses of symptomatic intracranial stenosis studies were conducted to compare the benefits of long-term therapy with warfarin to aspirin. The synthesis of evidence of effect from previous nonrandomized studies in monitoring a randomized clinical trial was of particular interest. Sequential Bayesian learning analysis was conducted and Bayesian hierarchical random effects models were used to incorporate variability between studies. The posterior point estimates for the risk rate ratio (RRR) were similar between analyses, although the interval estimates resulting from the hierarchical analyses are larger than the corresponding Bayesian learning analyses. This demonstrated the difference between these methods in accounting for …
A Maximum Test For The Analysis Of Ordered Categorical Data, Markus Neuhäeuser
A Maximum Test For The Analysis Of Ordered Categorical Data, Markus Neuhäeuser
Journal of Modern Applied Statistical Methods
Different scoring schemes are possible when performing exact tests using scores on ordered categorical data. The standard scheme is based on integer scores, but non-integer scores were proposed to increase power (Ivanova & Berger, 2001). However, different non-integer scores exist and the question arises as to which of the non-integer schemes should be chosen. To solve this problem, a maximum test is proposed. To be precise, the maximum of the competing statistics is used as the new test statistic, rather than arbitrarily choosing one single test statistic.
An Inductive Approach To Calculate The Mle For The Double Exponential Distribution, W. J. Hurley
An Inductive Approach To Calculate The Mle For The Double Exponential Distribution, W. J. Hurley
Journal of Modern Applied Statistical Methods
Norton (1984) presented a calculation of the MLE for the parameter of the double exponential distribution based on the calculus. An inductive approach is presented here.
New Effect Size Rules Of Thumb, Shlomo S. Sawilowsky
New Effect Size Rules Of Thumb, Shlomo S. Sawilowsky
Journal of Modern Applied Statistical Methods
Recommendations to expand Cohen’s (1988) rules of thumb for interpreting effect sizes are given to include very small, very large, and huge effect sizes. The reasons for the expansion, and implications for designing Monte Carlo studies, are discussed.
Multiple Search Paths And The General-To-Specific Methodology, Paul Turner
Multiple Search Paths And The General-To-Specific Methodology, Paul Turner
Journal of Modern Applied Statistical Methods
Increased interest in computer automation of the general-to-specific methodology has resulted from research by Hoover and Perez (1999) and Krolzig and Hendry (2001). This article presents simulation results for a multiple search path algorithm that has better properties than those generated by a single search path. The most noticeable improvements occur when the data contain unit roots.
Intermediate R Values For Use In The Fleishman Power Method, Julie M. Smith
Intermediate R Values For Use In The Fleishman Power Method, Julie M. Smith
Journal of Modern Applied Statistical Methods
Several intermediate r values are calculated at three different correlations for use in the Fleishman Power Method for generating correlated data from normal and non-normal populations.
Ordinal Regression Analysis: Fitting The Proportional Odds Model Using Stata, Sas And Spss, Xing Liu
Ordinal Regression Analysis: Fitting The Proportional Odds Model Using Stata, Sas And Spss, Xing Liu
Journal of Modern Applied Statistical Methods
Researchers have a variety of options when choosing statistical software packages that can perform ordinal logistic regression analyses. However, statistical software, such as Stata, SAS, and SPSS, may use different techniques to estimate the parameters. The purpose of this article is to (1) illustrate the use of Stata, SAS and SPSS to fit proportional odds models using educational data; and (2) compare the features and results for fitting the proportional odds model using Stata OLOGIT, SAS PROC LOGISTIC (ascending and descending), and SPSS PLUM. The assumption of the proportional odds was tested, and the results of the fitted models were …
Generating And Comparing Aggregate Variables For Use Across Datasets In Multilevel Analysis, James Chowhan, Laura Duncan
Generating And Comparing Aggregate Variables For Use Across Datasets In Multilevel Analysis, James Chowhan, Laura Duncan
Journal of Modern Applied Statistical Methods
This article examines the creation of contextual aggregate variables from one dataset for use with another dataset in multilevel analysis. The process of generating aggregate variables and methods of assessing the validity of the constructed aggregates are presented, together with the difficulties that this approach presents.
Jmasm28: Gibbs Sampling For 2pno Multi-Unidimensional Item Response Theory Models (Fortran), Yanyan Sheng, Todd C. Headrick
Jmasm28: Gibbs Sampling For 2pno Multi-Unidimensional Item Response Theory Models (Fortran), Yanyan Sheng, Todd C. Headrick
Journal of Modern Applied Statistical Methods
A Fortran 77 subroutine is provided for implementing the Gibbs sampling procedure to a multiunidimensional IRT model for binary item response data with the choice of uniform and normal prior distributions for item parameters. In addition to posterior estimates of the model parameters and their Monte Carlo standard errors, the algorithm also estimates the correlations between distinct latent traits. The subroutine requires the user to have access to the IMSL library. The source code is available at http://www.siuc.edu/~epse1/sheng/Fortran/MUIRT/GSMU2.FOR. An executable file is also provided for download at http://www.siuc.edu/~epse1/sheng/Fortran/MUIRT/EXAMPLE.zip to demonstrate the implementation of the algorithm on simulated data.
Operation Outreach: An Ongoing Leadership Project, Lisa Forrest
Operation Outreach: An Ongoing Leadership Project, Lisa Forrest
Lisa A Forrest
No abstract provided.
Potreros, Ganancias Y Poder. Una Historia Ambiental De La Ganadería En Colombia, 1850-1950, Shawn Van Ausdal
Potreros, Ganancias Y Poder. Una Historia Ambiental De La Ganadería En Colombia, 1850-1950, Shawn Van Ausdal
Shawn Van Ausdal
Este artículo examina la expansión de la ganadería entre 1850 y 1950 en los bosques de tierra caliente en Colombia. También explora el papel de la introducción de pastos africanos en el desarrollo de potreros, con énfasis en el mejoramiento de la productividad. Finalmente, el artículo sugiere que prestar mayor atención a los costos y a la mano de obra en la formación de potreros podría llevar a reexaminar algunos estereotipos comunes con respecto a la ganadería (por ejemplo, que el ganado era principalmente un medio para controlar el territorio). Esto, a su vez, debe ayudarnos a entender mejor la …
Sin Investigación Y Desarrollo No Hay Progreso Humano, Guillermo Arosemena
Sin Investigación Y Desarrollo No Hay Progreso Humano, Guillermo Arosemena
Guillermo Arosemena
No abstract provided.
Los Indicadores Operativos, Guillermo Arosemena
Los Indicadores Operativos, Guillermo Arosemena
Guillermo Arosemena
No abstract provided.
Más Allá Del 2009, Guillermo Arosemena
¿Qué Es Ser Gerente?, Guillermo Arosemena
10 Retos Para El 2010, Guillermo Arosemena
Olmedo Y Episodios De Su Época, Poco Conocidos- Primera A La Última Parte, Guillermo Arosemena
Olmedo Y Episodios De Su Época, Poco Conocidos- Primera A La Última Parte, Guillermo Arosemena
Guillermo Arosemena
No abstract provided.
Competition-Based Environmental Policy: An Analysis Of Farmland Preservation In Maryland, John K. Horowitz, Lori Lynch, Andrew J. Stocking
Competition-Based Environmental Policy: An Analysis Of Farmland Preservation In Maryland, John K. Horowitz, Lori Lynch, Andrew J. Stocking
Andrew J Stocking
Policy makers have turned to competition-based voluntary-enrollment programs as a cost-effective way to achieve preferred land uses. This paper studies bidder behavior in an innovative auction-based program in which farmers compete to sell and retire the right to develop their land. We derive a reduced-form bidding model that includes private and common values. This model allows us to estimate the role of bidder competition, winner’s curse correction, and the underlying distribution of private values. We estimate that the auction enrolled as many as 3,000 acres (12%) more than a take-it-or-leave-it offer would have enrolled for the same budgetary cost.
Learning Purposefully In Capacity Development: Why, What And When To Measure?, Alfredo Ortiz Aragón, Peter Taylor
Learning Purposefully In Capacity Development: Why, What And When To Measure?, Alfredo Ortiz Aragón, Peter Taylor
Alfredo Ortiz Aragón
Many capacity development (CD) programs and processes aim at long‐term sustainable change, which depends on seeing many smaller changes in at times almost invisible fields (rules, incentives, behaviours, power, coordination etc.). Yet, most evaluation processes of CD tend to focus on shortterm outputs focused on clearly visible changes. This opinion paper will offer some ideas on how to deal with this paradox, by examining how monitoring and evaluation (M&E) does, or could, make a difference to CD. It explores whether there is something different and unique about M&E of CD that isn’t addressed by predominant methods and ways of thinking …
Thoughts Of Suicidality And Self-Harm In Middle Childhood: Relationship With Child Maltreatment And Maternal Substance Abuse And Depression, Tara K. Cossel, Natasha Elkovitch, David J. Hansen
Thoughts Of Suicidality And Self-Harm In Middle Childhood: Relationship With Child Maltreatment And Maternal Substance Abuse And Depression, Tara K. Cossel, Natasha Elkovitch, David J. Hansen
Tara K. Cossel (Tara Morton)
Child maltreatment victims are at increased risk for a multitude of symptoms, including: internalizing problems (e.g., depression, anxiety), behavior problems (e.g., aggression) and post-traumatic stress symptoms (Paolucci, Genuis, & Violato, 2001). Not all maltreated children present with the same outcomes, and research consistently demonstrates child abuse does not have an inevitable pattern or a unified presentation of symptoms. Some youth may be asymptomatic following abuse; others display a myriad of symptoms at varying levels of severity (Kendall-Tackett, Williams, & Finkelhor, 1993). A small percentage of this group becomes suicidal.
Recent studies have presented accumulating evidence that suicidality and self-harm warrant …