The dynamics of product differentiation in the British record industry

The paper conducts a statistical analysis of the dynamics of the sale of new music (product differentiation innovation) in the record industry. In pursuing this goal the paper generates new data and analyses a previously unutilized data set. The paper finds that there is a strong correlation between new music innovation in the audio singles and albums market. This is found to be mainly concurrent in the same quarter and to have a reasonably short product life. The paper discovers that these features also characterise the dynamics of record company performance. The research indicates that record companies are willing to sell singles at a loss due to advertising rather than learning externalities. At the industry level, the paper finds that new music innovation does not effect market size significantly and mainly causes business stealing effects between record companies, with exceptional cases of multiplier effects.     

Comparison of three methods of estimating energy expenditure: caltrac, heart rate, and video analysis

This study examined the accuracy of a new device (Caltrac) in estimating energy expenditure via acceleration measurements. Energy expenditure of 20 high school students during basketball class activity (average length = 37 min) was estimated using the Caltrac, heart rate recording, and video analysis. Heart rate recording and video analysis estimates of energy expenditure were determined from heart rate, caloric expenditure curves, and an activity rating scale, respectively. The following estimates of caloric expenditure (M +/- SD) were found: heart rate recording = 196 +/- 73 greater than Caltrac = 163 +/- 49 greater than film analysis = 123 +/- 30 kcal (p less than .05). Laboratory simulations of the basketball activity revealed that the Caltrac energy expenditure was not significantly different from the actual energy expenditure (p greater than .05). The heart rate recording and video analysis estimates of energy expenditure were significantly (p less than .05) higher and lower, respectively, than the actual energy expenditure. The Caltrac is a lightweight, low-cost device that provides a relatively accurate estimate of energy expenditure in free-ranging activities, such as basketball.     

Performance Funding Programs: Assessing Their Stability

State programs of performance funding for public colleges and universities are both popular and volatile. A previous article identified some characteristics of stable programs by comparing the survey responses of state and campus leaders from Tennessee and Missouri about their mature programs with those from four states that later dropped performance funding. This article uses those characteristics to assess the stability of the continuing programs in Florida, Ohio, and South Carolina. This article compares the survey responses of state and campus leaders from each of these three states about their programs with those from Missouri and Tennessee. The findings suggest trouble for these three programs, for they share few of the characteristics common to the stable programs in Missouri and Tennessee.