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2010

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Articles 1651 - 1680 of 17892

Full-Text Articles in Social and Behavioral Sciences

Statistical And Mathematical Modeling Versus Nhst? There’S No Competition!, Joseph Lee Rodgers Nov 2010

Statistical And Mathematical Modeling Versus Nhst? There’S No Competition!, Joseph Lee Rodgers

Journal of Modern Applied Statistical Methods

Some of Robinson & Levin’s critique of Rodgers (2010) is cogent, helpful, and insightful – although limiting. Recent methodology has advanced through the development of structural equation modeling, multi-level modeling, missing data methods, hierarchical linear modeling, categorical data analysis, as well as the development of many dedicated and specific behavioral models. These methodological approaches are based on a revised epistemological system, and have emerged naturally, without the need for task forces, or even much self-conscious discussion. The original goal was neither to develop nor promote a modeling revolution. That has occurred; I documented its development and its status. Two organizing …

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Recommended Sample Size For Conducting Exploratory Factor Analysis On Dichotomous Data, Robert H. Pearson, Daniel J. Mundform Nov 2010

Recommended Sample Size For Conducting Exploratory Factor Analysis On Dichotomous Data, Robert H. Pearson, Daniel J. Mundform

Journal of Modern Applied Statistical Methods

Minimum sample sizes are recommended for conducting exploratory factor analysis on dichotomous data. A Monte Carlo simulation was conducted, varying the level of communalities, number of factors, variable-to-factor ratio and dichotomization threshold. Sample sizes were identified based on congruence between rotated population and sample factor loadings.

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Notes On Hypothesis Testing Under A Single-Stage Design In Phase Ii Trial, Kung-Jong Lui Nov 2010

Notes On Hypothesis Testing Under A Single-Stage Design In Phase Ii Trial, Kung-Jong Lui

Journal of Modern Applied Statistical Methods

A primary objective of a phase II trial is to determine future development is warranted for a new treatment based on whether it has sufficient activity against a specified type of tumor. Limitations exist in the commonly-used hypothesis setting and the standard test procedure for a phase II trial. This study reformats the hypothesis setting to mirror the clinical decision process in practice. Under the proposed hypothesis setting, the critical points and the minimum required sample size for a desired power of finding a superior treatment at a given α -level are presented. An example is provided to illustrate how …

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Effect Of Measurement Errors On The Separate And Combined Ratio And Product Estimators In Stratified Random Sampling, Housila P. Singh, Namrata Karpe Nov 2010

Effect Of Measurement Errors On The Separate And Combined Ratio And Product Estimators In Stratified Random Sampling, Housila P. Singh, Namrata Karpe

Journal of Modern Applied Statistical Methods

Separate and combined ratio, product and difference estimators are introduced for population mean μY of a study variable Y using auxiliary variable X in stratified sampling when the observations are contaminated with measurement errors. The bias and mean squared error of the proposed estimators have been derived under large sample approximation and their properties are analyzed. Generalized versions of these estimators are given along with their properties.

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Use Of Two Variables Having Common Mean To Improve The Bar-Lev, Bobovitch And Boukai Randomized Response Model, Oluseun Odumade, Sarjinder Singh Nov 2010

Use Of Two Variables Having Common Mean To Improve The Bar-Lev, Bobovitch And Boukai Randomized Response Model, Oluseun Odumade, Sarjinder Singh

Journal of Modern Applied Statistical Methods

A new method to improve the randomized response model due to Bar-Lev, Bobovitch and Boukai (2004) is suggested. It has been observed that if two sensitive (or non sensitive) variables exist that are related to the main study sensitive variable, then those variables could be used to construct ratio type adjustments to the usual estimator of the population mean of a sensitive variable due to Bar-Lev, Bobovitch and Boukai (2004).The relative efficiency of the proposed estimators is studied with respect to the Bar-Lev, Bobovitch and Boukai (2004) models under different situations.

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Incidence And Prevalence For A Triply Censored Data, Hilmi F. Kittani Nov 2010

Incidence And Prevalence For A Triply Censored Data, Hilmi F. Kittani

Journal of Modern Applied Statistical Methods

The model introduced for the natural history of a progressive disease has four disease states which are expressed as a joint distribution of three survival random variables. Covariates are included in the model using Cox’s proportional hazards model with necessary assumptions needed. Effects of the covariates are estimated and tested. Formulas for incidence in the preclinical, clinical and death states are obtained, and prevalence formulas are obtained for the preclinical and clinical states. Estimates of the sojourn times in the preclinical and clinical states are obtained.

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Robust Estimators In Logistic Regression: A Comparative Simulation Study, Sanizah Ahmad, Norazan Mohamed Ramli, Habshah Midi Nov 2010

Robust Estimators In Logistic Regression: A Comparative Simulation Study, Sanizah Ahmad, Norazan Mohamed Ramli, Habshah Midi

Journal of Modern Applied Statistical Methods

The maximum likelihood estimator (MLE) is commonly used to estimate the parameters of logistic regression models due to its efficiency under a parametric model. However, evidence has shown the MLE has an unduly effect on the parameter estimates in the presence of outliers. Robust methods are put forward to rectify this problem. This article examines the performance of the MLE and four existing robust estimators under different outlier patterns, which are investigated by real data sets and Monte Carlo simulation.

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A General Class Of Chain-Type Estimators In The Presence Of Non-Response Under Double Sampling Scheme, Sunil Kumar, Housila P. Singh, Sandeep Bhougal Nov 2010

A General Class Of Chain-Type Estimators In The Presence Of Non-Response Under Double Sampling Scheme, Sunil Kumar, Housila P. Singh, Sandeep Bhougal

Journal of Modern Applied Statistical Methods

General class chain ratio type estimators for estimating the population mean of a study variable are examined in the presence of non-response under a double sampling scheme using a factor-type estimator (FTE). Properties of the suggested estimators are studied and compared to those of existing estimators. An empirical study is carried out to demonstrate the performance of the suggested estimators; empirical results support the theoretical study.

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Maximum Downside Semi Deviation Stochastic Programming For Portfolio Optimization Problem, Anton Abdulbasah Kamil, Khlipah Ibrahim Nov 2010

Maximum Downside Semi Deviation Stochastic Programming For Portfolio Optimization Problem, Anton Abdulbasah Kamil, Khlipah Ibrahim

Journal of Modern Applied Statistical Methods

Portfolio optimization is an important research field in financial decision making. The chief character within optimization problems is the uncertainty of future returns. Probabilistic methods are used alongside optimization techniques. Markowitz (1952, 1959) introduced the concept of risk into the problem and used a mean-variance model to identify risk with the volatility (variance) of the random objective. The mean-risk optimization paradigm has since been expanded extensively both theoretically and computationally. A single stage and two stage stochastic programming model with recourse are presented for risk averse investors with the objective of minimizing the maximum downside semideviation. The models employ the …

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On Bayesian Shrinkage Setup For Item Failure Data Under A Family Of Life Testing Distribution, Gyan Prakash Nov 2010

On Bayesian Shrinkage Setup For Item Failure Data Under A Family Of Life Testing Distribution, Gyan Prakash

Journal of Modern Applied Statistical Methods

Properties of the Bayes shrinkage estimator for the parameter are studied of a family of probability density function when item failure data are available. The symmetric and asymmetric loss functions are considered for two different prior distributions. In addition, the Bayes estimates of reliability function and hazard rate are obtained and their properties are studied.

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Empirical Characteristic Function Approach To Goodness Of Fit Tests For The Logistic Distribution Under Srs And Rss, M. T. Alodat, S. A. Al-Subh, Kamaruzaman Ibrahim, Abdul Aziz Jemain Nov 2010

Empirical Characteristic Function Approach To Goodness Of Fit Tests For The Logistic Distribution Under Srs And Rss, M. T. Alodat, S. A. Al-Subh, Kamaruzaman Ibrahim, Abdul Aziz Jemain

Journal of Modern Applied Statistical Methods

The integral of the squares modulus of the difference between the empirical characteristic function and the characteristic function of the hypothesized distribution is used by Wong and Sim (2000) to test for goodness of fit. A weighted version of Wong and Sim (2000) under ranked set sampling, a sampling technique introduced by McIntyre (1952), is examined. Simulations that show the ranked set sampling counterpart of Wong and Sim (2000) is more powerful.

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Bayesian Analysis Of Location-Scale Family Of Distributions Using S-Plus And R Software, Sheikh Parvaiz Ahmad, Aquil Ahmed, Athar Ali Khan Nov 2010

Bayesian Analysis Of Location-Scale Family Of Distributions Using S-Plus And R Software, Sheikh Parvaiz Ahmad, Aquil Ahmed, Athar Ali Khan

Journal of Modern Applied Statistical Methods

The Normal and Laplace’s methods of approximation for posterior density based on the location-scale family of distributions in terms of the numerical and graphical simulation are examined using S-PLUS and R Software.

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Neighbor Balanced Block Designs For Two Factors, Seema Jaggi, Cini Varghese, N. R. Abeynayake Nov 2010

Neighbor Balanced Block Designs For Two Factors, Seema Jaggi, Cini Varghese, N. R. Abeynayake

Journal of Modern Applied Statistical Methods

The concept of Neighbor Balanced Block (NBB) designs is defined for the experimental situation where the treatments are combinations of levels of two factors and only one of the factors exhibits a neighbor effect. Methods of constructing complete NBB designs for two factors in a plot that is strongly neighbor balanced for one factor are obtained. These designs are variance balanced for estimating the direct effects of contrasts pertaining to combinations of levels of both the factors. An incomplete NBB design for two factors is also presented and is found to be partially variance balanced with three associate classes.

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Ann Forecasting Models For Ise National-100 Index, Ozer Ozdemir, Atilla Aslanargun, Senay Asma Nov 2010

Ann Forecasting Models For Ise National-100 Index, Ozer Ozdemir, Atilla Aslanargun, Senay Asma

Journal of Modern Applied Statistical Methods

Prediction of the outputs of real world systems with accuracy and high speed is crucial in financial analysis due to its effects on worldwide economics. Because the inputs of the financial systems are timevarying functions, the development of algorithms and methods for modeling such systems cannot be neglected. The most appropriate forecasting model for the ISE national-100 index was investigated. Box- Jenkins autoregressive integrated moving average (ARIMA) and artificial neural networks (ANN) are considered by using several evaluations. Results showed that the ANN model with linear architecture better fits the candidate data.

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Bayesian Analysis For Component Manufacturing Processes, L. V. Nandakishore Nov 2010

Bayesian Analysis For Component Manufacturing Processes, L. V. Nandakishore

Journal of Modern Applied Statistical Methods

In manufacturing processes various machines are used to produce the same product. Based on the age, make, etc., of the machines the output may not always follow the same distribution. An attempt is made to introduce Bayesian techniques for a two machine problem. Two cases are presented in this article.

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Markov Chain Analysis And Student Academic Progress: An Empirical Comparative Study, Shafiqah Alawadhi, Mokhtar Konsowa Nov 2010

Markov Chain Analysis And Student Academic Progress: An Empirical Comparative Study, Shafiqah Alawadhi, Mokhtar Konsowa

Journal of Modern Applied Statistical Methods

An application of Markov Chain Analysis of student flow at Kuwait University is presented based on a random sample of 1,100 students from the academic years 1996-1997 to 2004-2005. Results were obtained for each college and in total which allows for a comparative study. The students’ mean lifetimes in different levels of study in the colleges as well as the percentage of dropping out of the system are estimated.

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Random Ramblings: The Myth Of The Unique User, Robert P. Holley Nov 2010

Random Ramblings: The Myth Of The Unique User, Robert P. Holley

School of Information Sciences Faculty Research Publications

No abstract provided.

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Critical Illness Myopathy, Tazeen S. Ali Dr, Salima Moez Meherali Dr, Yasmin Parpio Dr Nov 2010

Critical Illness Myopathy, Tazeen S. Ali Dr, Salima Moez Meherali Dr, Yasmin Parpio Dr

Tazeen S Ali Dr

Critical illness myopathy (CIM) is a syndrome of widespread muscle weakness and neurological dysfunction which can develop in critically ill patients receiving intensive care. CIM are often distinguished largely on the basis of specialized electrophysiologic testing or muscle and nerve biopsy and its causes are unknown, though they are thought to be a possible neurological manifestation of systemic inflammatory response syndrome usually developing in patients after a brief period of stay in the Intensive Care Unit (ICU). This case report aims to analyze the Clinical feature, diagnosis and treatment of CIM of 60 years old male case with Chronic Obstructive …

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Morphogrammatics Of Reflection, Rudolf Kaehr Nov 2010

Morphogrammatics Of Reflection, Rudolf Kaehr

Rudolf Kaehr

Turning back from the studies of morphogrammatics to some open questions of reflectional programming, the recountered problematics might be put into a different light and new methods of handling formal aspects of reflection and reflectionality shall be introduced. Albeit the use of light-metaphors, morphogrammatic reflection is not sketched along the paradigm of optical metaphors. Morphograms are presenting neither propositions nor perceptions able for mirroring (representation). Exercises in defining morphogrammatic retro-grade recursion and reflection schemata are continued from the paper “Sketches to Morphogrammatic Programming”.

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Desigualdad De La Renta De Ecuador En Relación A La De América Latina, Guillermo Arosemena Nov 2010

Desigualdad De La Renta De Ecuador En Relación A La De América Latina, Guillermo Arosemena

Guillermo Arosemena

No abstract provided.

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Post-Earthquake Housing Recovery In Bachhau, India: The Homeowner, The Renter, And The Squatter, Anuradha Mukherji Nov 2010

Post-Earthquake Housing Recovery In Bachhau, India: The Homeowner, The Renter, And The Squatter, Anuradha Mukherji

Anuradha Mukherji

This paper looks at post-earthquake housing recovery in Bachhau, a town close to the epicenter of the 2001 Gujarat earthquake in western India. This research examines the difference in housing recovery outcomes among homeowners, squatters, and renters in Bachhau, in order to understand why single-family homeowners and squatters were able to rebuild and improve their housing conditions whereas low-income renters continued to struggle toward housing recovery. This paper shows that communities in Bachhau did not have the resources or capacities to rebuild themselves and that appropriate public assistance was critical for housing recovery. While public assistance was mainly targeted to …

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Voting On Parametric Reforms Of The Pay-As-You-Go Pension System, Georges Casamatta, João Luis Brasil Gondim Nov 2010

Voting On Parametric Reforms Of The Pay-As-You-Go Pension System, Georges Casamatta, João Luis Brasil Gondim

Georges Casamatta

We assess the political support for parametric reforms of the Pay-As-You-Go pension system following a drop in the fertility rate. Using a continuous time overlapping generations model, we argue that reforms that consist in cutting pension benefits or increasing the retirement age are likely to receive a strong political support. An increase in the contribution rate has, on the contrary, fewer chances to be approved by the majority of the voters. This framework also allows to identify the costs and benefits of postponing each type of reform and to determine how the timing of the different reforms affects their political …

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La Autonomía Universitaria: Una Perspectiva Política, Imanol Ordorika Nov 2010

La Autonomía Universitaria: Una Perspectiva Política, Imanol Ordorika

Imanol Ordorika

En este artículo se discute la relación entre la autonomía —como forma de interacción entre las universidades y otras instituciones del Estado— con la conceptualización sobre la misma, en particular para el caso de la UNAM y otras universidades mexicanas. Se pone énfasis en la naturaleza política de la autonomía y por ende la necesidad de desarrollar perspectivas de corte político para su análisis y comprensión.

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First Annual Invention2venture (I2v) Apprentice Challenge Workshop (2010) Nov 2010

First Annual Invention2venture (I2v) Apprentice Challenge Workshop (2010)

Paul Swamidass

In a nutshell, a number of AU student teams, after an introduction from experts on starting and running a business, were challenged along the lines of Mr. Trump’s TV show, “The Apprentice,” to start a business and produce income in 72 hours with $100 seed investment given to each team. The teams delivered, and in the process gained hands-on experience in entrepreneurship; the teams returned the seed investment and kept the profits. Two teams were rewarded.

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Product Concept To Complete Business Plan In Three Months In An Ug Course For Business + Engineering Students, Paul Swamidass, Nels Madsen, P.K. Raju, Jackie Dipofi Nov 2010

Product Concept To Complete Business Plan In Three Months In An Ug Course For Business + Engineering Students, Paul Swamidass, Nels Madsen, P.K. Raju, Jackie Dipofi

Paul Swamidass

sophomores/juniors work in multi-disciplinary teams to conceive and select a technology-intensive product, develop a project schedule, conduct market research and survey, complete product engineering/design, make manufacturing/sourcing decisions, estimate demand for five years, develop production/sourcing capacity, estimate investment needed and 5-yr cash flow as part of a business plan in 3 months; the business plan presentation is judged by a panel. The course is called Introduction to Business and Engineering but it is a holistic Technology Ventures course that prepares engineering and business students to partner together in bringing a technology-intensive product to the market. This course can be easily adopted …

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Competition Between Specialized Candidates, Stefan Krasa, Mattias K. Polborn Nov 2010

Competition Between Specialized Candidates, Stefan Krasa, Mattias K. Polborn

Mattias K Polborn

Opposing candidates for a political office often differ in their professional backgrounds and previous political experience, leading to both real and perceived differences in political capabilities. We analyze a formal model in which candidates with different productivities in two policy areas compete for voters by choosing how much money or effort they would allocate to each area if elected. The model has a unique equilibrium that differs substantially from the standard median-voter model. While candidates compete for the support of a moderate voter type, this cutoff voter differs from the expected median voter. Moreover, no voter type except the cutoff …

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The Emergence Of Indigenous Movements In Latin America And Their Impact On The Latin American Political Scene., Salvador Marti I Puig Nov 2010

The Emergence Of Indigenous Movements In Latin America And Their Impact On The Latin American Political Scene., Salvador Marti I Puig

Salvador Marti i Puig

The past two decades have seen the emergence of various political actors in Latin America for whom indigenousness is their basic social identity. The appearance of indig- enous movements at this time can be attributed to a change in the structure of political opportunities in response to globalization, which has created a situation in which policy making is no longer controlled by governments but increasingly the result of the interac- tion of a wide variety of actors. Indigenous peoples have been empowered by alliances with actors that have provided them greater capacity for applying pressure through rela- tionships, including churches, …

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Residential And Business Broadband Prices: Data Appendix, Scott J. Wallsten, James Riso Nov 2010

Residential And Business Broadband Prices: Data Appendix, Scott J. Wallsten, James Riso

Scott J. Wallsten

No abstract provided.

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Moral Hazard In Leasing Contracts: Evidence From The New York City Taxi Industry, Henry S. Schneider Nov 2010

Moral Hazard In Leasing Contracts: Evidence From The New York City Taxi Industry, Henry S. Schneider

Henry S Schneider

In this study, I investigate the effects of moral hazard in leasing contracts by examining the driving outcomes of all long-term lessees and owner-operators of New York City taxis. I find that moral hazard explains a sizable fraction of lessees’ accidents, driving violations, and vehicle inspection failures. To address the possibility of endogenous contract choice, I conduct an instrumental variables analysis of the cross section of all drivers and a panel-data analysis of a subset of drivers who switched from leasing to owning.

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International Trade, Structural Deformations And Hegemony In Islamic And Arabic Countries, Professor Issam A.W. Mohamed, Dr. Mohamed A. Osman Nov 2010

International Trade, Structural Deformations And Hegemony In Islamic And Arabic Countries, Professor Issam A.W. Mohamed, Dr. Mohamed A. Osman

Professor Issam A.W. Mohamed

Contemporary world economic situation seems gloomy with the shadows of recession in many big economies. There attempts to rectify that situation with domestic restructuring and improvements in social parameters. However, it is imperative that holistic approaches should be reviewed whereas part of them are helping developing economies to improve productivity and expand their exports and imports. The books reviews issues of international trade as presented in theories and de facto applications. Historical backgrounds are analyzed to emphasize their impacts on the present situations. Within the parameters discussed are crusades and ensuing colonization. All these foot prints are still engraved in …

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