Estimated Age Effects in Baseball

Age effects in baseball are estimated in this paper using a nonlinear fixed-effects regression. The sample consists of all players who have played 10 or more "full-time" years in the major leagues between 1921 and 2004. Quadratic improvement is assumed up to a peak-performance age, which is estimated, and then quadratic decline after that, where the two quadratics need not be the same. Each player has his own constant term. The results show that aging effects are larger for pitchers than for batters and larger for baseball than for track and field, running, and swimming events and for chess. There is some evidence that decline rates in baseball have decreased slightly in the more recent period, but they are still generally larger than those for the other events. There are 18 batters out of the sample of 441 whose performances in the second half of their careers noticeably exceed what the model predicts they should have been. All but 3 of these players played from 1990 on. The estimates from the fixed-effects regressions can also be used to rank players. This ranking differs from the ranking using lifetime averages because it adjusts for the different ages at which players played. It is in effect an age-adjusted ranking.Aging, Baseball performance

Photon production by charged particles in narrow optical fibers

A charged particle passing through or by an optical fiber induces emission of light guided by the fiber. The formula giving the spontaneous emission amplitude are given in the general case when the particle trajectory is not parallel to the fiber axis. At small angle, the photon yield grows like the inverse power of the angle and in the parallel limiting case the fiber Cherenkov effect studied by Bogdankevich and Bolotovskii is recovered. Possible application to beam diagnostics are discussed, as well as resonance effects when the particle trajectory or the fiber is bent periodically.Comment: Presented at International Conference on Charged and Neutral Particles Channeling Phenomena, Frascati, Italy, July 3-7, 200

Does Monetary Policy Matter? Narrative Versus Structural Approaches

This paper compares results from the narrative approach of Romer and Romer (1989) to those from the structural approach regarding the effects of monetary policy on real output. The results from both approaches lead to the conclusions that monetary policy matters and that the effects build slowly following a monetary policy shock. The narrative approach, however, leads to larger and more persistent effects than does the structural approach. Reasons are advanced in the paper as to why this might be so.

Estimated Macroeconomic Effects of Deficit Targeting

Somemacroeconomic effects of deficit targeting are estimated in thispaper using my U.S. econometric model. The response of the economy to realand price shocks is examined in a number of cases. Each case corresponds toa particular assumption about fiscal policy and a particular assumptionabout monetary policy. Estimates are also presented of the size of thegovernment spending cuts that are needed to meet a given deficit goal underdifferent assumptions about monetary policy.

International Evidence on the Demand for Money

One of the current questions in the literature on the demand for money is whether the adjustment of actual to desired money holdings is in nominal or real terms. This paper describes a simple procedure than can be used to test the nominal against the real hypothesis. The test is carried out for 27 countries. The paper also tests the structural stability of the demand for money equations and the correctness of the dynamic specification. The results are strongly in favor of the nominal adjustment hypothesis. The estimated equations are quite good in terms of the number of coefficient estimates that are of the right sign and that are significant. The equations also stand up well when tested against a more general dynamic specification. There is, however, some evidence of structural instability before and after 1973, although the instability is generally moderate. The instability does not affect the conclusion that the nominal adjustment hypothesis dominates the real adjustment hypothesis.

Skylab atmospheric contamination control

The Skylab contamination removal systems, preflight analysis and testing, and flight results are described. Results indicate that the combination of materials selection, the onboard removal devices, and the offgassing tests proved to be an effective means of controlling spacecraft contaminant levels

Estimated Macroeconomic Effects of the U.S. Stimulus Bill

This paper uses a multicountry macroeconometric model to estimate the macroeconomic effects of the U.S. stimulus bill passed in February 2009. The analysis has the advantage of taking into account many endogenous effects. Real U.S. output is estimated to be $554 billion larger when summed over the 12-year period 2009:1-2020:4 (0.29 percent of the total sum of output). The average number of jobs is 509 thousand larger (0.37 percent). There is some redistribution of output and employment away from 2012-2015. At the end of 2020 the federal government debt is larger by$637 billion in real terms (the debt/GDP ratio is larger by 3.19 percentage points), which may increase the risk of negative asset-market reactions.Stimulus effects, Government spending multipliers

On Modeling the Effects of Inflation Shocks

A popular model in the literature postulates an interest rate rule, a NAIRU price equation, and an aggregate demand equation in which aggregate demand depends on the real interest rate. In this model a positive inflation shock with the nominal interest rate held constant is explosive because it increases aggregate demand (because the real interest rate is lower), which increases inflation through the price equation, which further increases aggregate demand, and so on. In order for the model to be stable, the nominal interest rate must rise more than inflation, which means that the coefficient on inflation in the interest rate rule must be greater than one. The results in this paper suggest, however, that an inflation shock with the nominal interest rate held constant has a negative effect on real output. There are three reasons. First, the data support the use of nominal rather than real interest rates in aggregate expenditure equations. Second, the evidence suggests that the percentage increase in nominal household wealth from a positive inflation shock is less than the percentage increase in the price level, which is contractionary because of the fall in real wealth. Third, there is evidence that wages lag prices, and so a positive inflation shock results in an initial fall in real wage rates and thus real labor income, which is contractionary. If these three features are true, they imply that a positive inflation shock has a negative effect on aggregate demand even if the nominal interest rate is held constant. Not only does the Fed not have to increase the nominal interest rate more than the increase in inflation for there to be a contraction, it does not have to increase the nominal rate at all!Macroeconomics, monetary policy

Analyzing Macroeconomic Forecastability

This paper estimates, using stochastic simulation and a multicountry macroeconometric model, the fraction of the forecast-error variance of output changes and the fraction of the forecast-error variance of inflation that are due to unpredictable asset-price changes. The results suggest that between about 25 and 37 percent of the forecast-error variance of output growth over 8 quarters is due to asset-price changes and between about 33 and 60 percent of the forecast-error variance of inflation over 8 quarters is due to asset-price changes. These estimates provide limits to the accuracy that can be expected from macroeconomic forecasting.Macroeconomic forecasting, Recessions, Booms

Predicting Electoral College Victory Probabilities from State Probability Data

A method is proposed in this paper for predicting Electoral College victory probabilities from state probability data. A "ranking" assumption about dependencies across states is made that greatly simplifies the analysis. The method issued to analyze state probability data from the Intrade political betting market. The Intrade prices of various contracts are quite close to what would be expected under the ranking assumption. Under the joint hypothesis that the Intrade price ranking is correct and the ranking assumption is correct, President Bush should not have won any state ranked below a state that he lost. He did not win any such state. The ranking assumption is also consistent with the fact that the two parties spent essentially nothing in most states in 2004.Electoral College victory probabilities, political betting markets