Sloan Komissarov and James Murray
Journal of Academic Librianship, Volume 42(4), pages 423-429, 2016.
Abstract: Informed from a survey we administered to undergraduate students on their information seeking behavior, we identify variables that influence how students conduct their search for sources, what types of sources they select, and what attributes of their sources they value. These variables relate to student academic characteristics, demographics, and actions that have been taken by instructors and library staff. With a thorough understanding of students' information seeking process and its influences, we find opportunities for instructors and librarians to have a positive influence.
Pedro de Araujo and James Murray
Journal of Policy Modeling, Volume 37(4), pages 548-576, 2015.
Abstract:The spread of HIV and AIDS and risky sexual behavior continues to be a problem in Sub-Saharan African countries despite government measures to educate people on the risk and severity of the disease and measures to promote safe sex practices such as making condoms readily available at reduced or no cost. We examine whether people decide to engage in risky sexual behavior due to low income and low life expectancy. Sub-Saharan Africa is characterized by conditions that significantly reduce life expectancy such as unsanitary conditions prevalent in poverty stricken areas, inaccessibility to health care, and dangerous working conditions such as those in very poor mining regions. Moreover, since income per capita in these countries is very low, the opportunity cost associated with dying from AIDS and foregoing future consumption is very low. We examine how a government provided life insurance benefit may be an effective means of deterring risky sexual behavior. To evaluate this policy prescription we develop a life-cycle model with personal and family consumption and endogenous probability of survival. In the model, agents can receive life insurance benefits if their death is not the result of AIDS. We demonstrate that excessive risky behavior does result from low life expectancy and low levels of income and illustrate the conditions for which the life insurance benefit can replicate the effects of higher income and life expectancy, deterring risky sexual behavior and reducing the spread of HIV/AIDS.
Elizabeth Knowles and James Murray
Journal of Education for Business, Volume 89(8), pages 389-395, 2014.
Abstract:Students often struggle to select appropriate statistical tests when investigating research questions. The authors present a lesson study designed to make students’ thought processes visible while considering this choice. The authors taught their students a way to organize knowledge about statistical tests and observed its impact in the classroom and in students’ written work. The results from this intervention were mixed, but the authors discuss where they found evidence for improvement in students’ performance and thought processes. The classroom observations revealed that students have difficulty identifying variables and understanding the precise use of statistical language.
Nicholas Herro and James Murray
Economics Bulletin, Volume 33(1), pages 257-270, 2013.
Abstract: A large literature lauds the benefits of central bank transparency and credibility, but when a central bank like the U.S. Federal Reserve has a dual mandate, is not specific to the extent it targets employment versus price stability, and is not specific to the magnitude interest rates should change in response to these targets, market participants must depend largely on past data to form expectations about monetary policy. We suppose market participants estimate a Taylor-like regression equation to understand the conduct of monetary policy, which likely guides their short-run and long-run expectations. When the Federal Reserve's actions deviate from its historical targets for macroeconomic variables, an environment of greater uncertainty may be the result. We quantify this degree of uncertainty by measuring and aggregating recent deviations of the federal funds rate from econometric forecasts predicted by constant gain learning. We incorporate this measure of uncertainty into a VAR model with ARCH shocks to measure the effect monetary policy uncertainty has on inflation, output growth, unemployment, and the volatility of these variables. We find that a higher degree of uncertainty regarding monetary policy is associated with greater volatility of output growth and unemployment.
Journal of Economic Education, Volume 43(3), page 348, 2012.
Abstract:A 'Pencast' is a video of someone writing on a notebook page, while describing what they are writing. It is made with a special ballpoint pen, called a SmartPen and made by LiveScribe, that has a small video camera looking at the tip and a microphone to record audio. I created Pencasts that teach common material in Introductory Macroeconomics, covering nine topics from the course (each topic includes 2-8 Pencasts, for a total of 40 Pencasts). The style of these Pencasts are friendly and inviting, and emphasize intuition behind graphical modeling and problem solving, which is effectively taught by practicing problems with students. Each pencast is short (2-9 minutes in length, most are 4-6 minutes) with a specific focus. Some focus on a specific aspect of a concept, like what shifts an investment demand curve; others describe a worked out example, like how to use and compute the expenditure multiplier.
Michael Haupert and James Murray
Cliometrica, Volume 6(2), pages 143-162, 2012.
Abstract:Over the course of the twentieth century, American wages increased by a factor of about 100, while the wages of professional baseball players increased by a factor of 450, but that increase was neither smooth nor consistent. We use a unique and expansive dataset of salaries and performance variables of Major League Baseball pitchers that spans over 400 players and 60 years during the reserve clause era to identify factors that determine salaries and examine how the importance of various factors have changed over time. We employ a Markov regime-switching regression model borrowed from the macroeconomics literature, which allows regression coefficients to switch exogenously between two or more values as time progresses. This method lets us identify changes in wage determination that may have occurred because of a change in the league’s competitiveness, a change in the relative bargaining power between players and teams, or other factors that may be unknown or unobservable. We find that even though Major League Baseball was a tightly controlled monopsony with the reserve clause, there was a significant shift in salary determination that lasted from the Great Depression until after World War II where players’ salaries were more highly linked to their recent performance.
Pedro de Araujo and James Murray
American Journal of Business Education, Volume 3(12), pages 57-64, 2010.
Abstract: In a recent study, de Araujo and Murray (2010) find empirical evidence that living on campus leads to improved student performance, finding both immediate effects (GPA improves while the student lives on campus) and permanent effects (GPA remains higher even after moving off campus). Using the same dataset, we extend the analysis to explain why students that live on campus perform better. We examine two possible channels. First, we examine whether on-campus students are more likely to take advantage of university provided resources (libraries, tutors, computer technology, university sponsored extracurricular activities, etc) than off-campus students. Secondly, we examine peer influences and interactions, including collaborative studying with friends and/or classmates and engagement in drug and alcohol consumption. For both these channels, we look for evidence of immediate and permanent effects. We find significant peer-effect channels that explain the positive permanent effect of academic performance from living on campus, and find two channels that explain why students should immediately perform better while they live on campus, but the evidence does not point to utilization of university resources.
Pedro de Araujo and James Murray
Economics Bulletin, Volume 30(1), pages 866-878, 2010.
Abstract:Many large universities require freshman to live in dormitories on the basis that living on campus leads to better classroom performance and lower drop out incidence. Large universities also provide a number of academic services in dormitories such as tutoring and student organizations that encourage an environment condusive to learning. A survey was administered to college students at a large state school to determine what impact dormitory living has on student performance. We use a handful of instrumental variable strategies to account for the possibly endogenous decision to live on campus. We find a robust result across model specifications and estimation techniques that on average, living on campus increases GPA by between 0.19 to 0.97. That is, the estimate for the degree of improvement to student performance caused by living on campus ranges between one-fifth to one full letter grade.
Glenn Knowles, James Murray, Keith Sherony and Michael Haupert
Cliometrica, Volume 12(1), pages 59-71, 2003.
Abstract:Shirking has become an issue in professional sports with the advent of long-term guaranteed contracts, particularly because pay is largely uncoupled from performance. Baseball player-owner relations are a classic example of the principal-agent problem, which investigates incentive problems between contracting parties. The agent (player) is said to shirk if he chooses not to undertake efficient actions measured in terms of on-field performance. From the viewpoint of the principal (owner), actions are considered efficient when they afford the greatest opportunity for profit. Shirking, or inefficient action, is most likely to occur when contracts do not satisfy the incentive compatibility constraint. The constraint is satisfied when the contract spells out incentives that cause the agent to take efficient actions. In the case of both one-year contracts with a reserve clause and long-term guaranteed contracts in Major League baseball (MLB), there may be inadequate financial incentives for players to perform to the best of their ability, that is, efficiently.
Abstract: I examine fiscal policy uncertainty in a context where market participants learn about the conduct of fiscal policy with regression rules for dependent variables including tax revenue, net transfers, government spending, and government debt. The explanatory variables include lagged fiscal policy, lagged government debt, and macroeconomic outcomes including real GDP, consumption, investment, and the unemployment rate. They re-run these regressions each quarter as a new observation becomes available, updating their understanding of the conduct of fiscal policy. I use the root mean squared errors as measures for fiscal policy uncertainty. I use autoregressive distributed lag (ARDL) models to estimate the effect fiscal uncertainty has on macroeconomic outcomes including real GDP, consumption, investment and unemployment. I find that the common component for fiscal policy uncertainty has adverse effects on real GDP, consumption, and investment. I find the buildup of fiscal policy uncertainty from 2005 through 2009 leads to a decline in real GDP growth by about 2 percentage points. I demonstrate that these finding are robust to lag specifications for the ARDL models and parameter specifications for the learning process.
Abstract: This paper examines the role of judgment shocks in combination with other structural shocks in explaining post-war economic volatility within the context of a New Keynesian model. Agents form expectations using constant gain learning then augment these forecasts with judgment. These judgments may be interpreted as a reaction to current news stories or policy announcements that would influence people's expectations. I allow for the possibility that these judgments be informatively based on information about structural shocks, but judgment itself may also be subject to its own stochastic shocks. I estimate a standard New Keynesian model that includes these shocks using Bayesian simulation methods. To aid in identifying expectational shocks from other structural shocks I include data on professional forecasts along with data on output gap, inflation, and interest rates. I find judgment is largely not informed by macroeconomic fundamentals; most of the variability in judgment is explained by its own stochastic shocks. Impulse response functions from the estimated model illustrate how shocks to judgment destabilize the economy and explain business cycle fluctuations.
Abstract:This paper examines the "bad luck" explanation for changing volatility in U.S. inflation and output when agents do not have rational expectations, but instead form expectations through least squares learning with an endogenously changing learning gain. It has been suggested that this type of endogenously changing learning mechanism can create periods of excess volatility without the need for changes in the variance of the underlying shocks. Bad luck is modeled into a standard New Keynesian model by augmenting it with two states that evolve according to a Markov chain, where one state is characterized by large variances for structural shocks, and the other state has relatively smaller variances. To assess whether learning can explain the Great Moderation, the New Keynesian model with volatility regime switching and dynamic gain learning is estimated by maximum likelihood. The results show that learning does lead to lower variances for the shocks in the volatile regime, but changes in regime is still significant in differences in volatility from the 1970s and after the the 1980s.
Abstract: This paper examines the empirical significance of learning, a type of adaptive, boundedly rational expectations, in the U.S. economy within the framework of the New Keynesian model with endogenous capital accumulation. Estimation results for learning models can be sensitive to the choice for agents' initial expectations, so three methods for choosing initial expectations are examined. Maximum likelihood results show that learning under all methods do not significantly improve the fit the model. The evolution of forecast errors show that the learning models do not out perform the rational expectations model during the run-up of inflation in the 1970s and the subsequent decline in the 1980s, a period of U.S. history which others have suggested learning may play a role. Despite the failure of learning models to better explain the data, analysis of the impulse response functions and paths of structural shocks during the sample show that learning can lead to different explanations for the data.
Abstract:This paper examines how the estimation results for a standard New Keynesian model with constant gain least squares learning is sensitive to the stance taken on agents' beliefs at the beginning of the sample. The New Keynesian model is estimated under rational expectations and under learning with three different frameworks for how expectations are set at the beginning of the sample. The results show that initial beliefs can have an impact on the predictions of an estimated model; in fact previous literature has exposed this sensitivity to explain the changing volatilities of output and inflation in the post-war United States. The results indicate statistical evidence for adaptive learning, however the rational expectations framework performs at least as well as the learning frameworks, if not better, in in-sample and out-of-sample forecast error criteria. Moreover, learning is not found to better explain time varying macroeconomic volatility any better than rational expectations. Finally, impulse response functions from the estimated models show that the dynamics following a structural shock can depend crucially on how expectations are initialized and what information agents are assumed to have.