Lawrence C. Marsh

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1. Abstract The purpose of this paper is to demonstrate how to use SAS0 to estimate a piecewise linear or higher order spline regression model. The method of estimation depends upon whether the join point-is known in advance or has to be estimated and whether a linear or a higher order model is used. When the location of the join point is not known but some(More)
Baseline sales measure what retail sales would be in the absence of a promotion (Abraham and Lodish 1993), and models that measure baseline sales are widely used by managers to assess the profitability of promotions (Bucklin and Gupta 1999–this issue). Estimates of baseline sales and promotional response are typically independent of past promotional(More)
This study investigates young children's understanding of homophones in two different linguistic contexts. Research has shown that children interpret homophones according to their 'primary' sense even though this is inappropriate to the linguistic context. The present study investigates the influence of different contexts on their interpretations of(More)
Uncertainties associated with the effects from chronic low-level exposures to radiation prompted us to construct a Low Dose Rate Irradiation Facility (LoDIF). The facility was designed specifically to test the appropriateness of the 10 mGy d(-1) guideline often espoused as acceptable for protection of aquatic biota from ionizing radiation. Scientists at the(More)
In this response we reply to Campbell's criticisms of our article in the March 2012 issue of Presidential Studies Quarterly. We demonstrate algebraically that Campbell's preferred model of the economy, which includes a lagged value of the dependent variable, merely disguises the impact of the president on economic performance. We reject his other criticisms(More)
The social security system offers an interesting challenge to modelers. It is probably the only program in the government sector that is essentially a closed system since revenues must equal receipts if the system is to remain self-financed. Furthermore, the program is now tied to changes in the Consumer Price Index (CPI)and average wages rather than to the(More)
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