Research for Mathematical Models

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December 1, 1996
In 1955, the Office of Management and Budget (OMB) implemented a policy known as the Commercial Activities (CA) Program. This program enables the private sector to compete with government organizations in providing goods and services when it is appropriate and economical to do so. The objective is to promote an efficient support structure through competition. This research memorandum is part of a CNA-initiated research effort examining the DoD Commercial Activities program. Most of our previous research has examined the Navy CA program. This paper presents the results of all completed DoD comprehensive A076 competitions between 1978 and 1994.
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October 1, 1996
The end of the Cold War has led to a major reexamination of the requirements fir medical personnel and other resources necessary to care for Department of Defense (DoD) beneficiaries. Despite large numbers of peacetime beneficiaries, the primary need for medical resources remains the wartime mission. During the Cold War, the requirement for wartime medical providers was high and could easily justify large numbers of active duty personnel. Today's defense guidance is based on fighting two major regional contingencies (MRCs), and the required number of medical providers has fallen sharply. Determining the number and types of medical resources needed to treat casualties of future conflicts is an important and complicated issue. To help shed light on the process of determining wartime medical requirements, N-931 asked CNA to examine the methods and models that are currently in use or may be used in the near future. The current process is in flux. The models used today are being changed. The use of one model was discontinued recently when the Joint Staff changed to a new command-and-control system. The Joint Staff has proposed a replacement, but the new model is still being developed and there is some concern about its adequacy in determining service medical requirements. In this memorandum, we examine the current and proposed theater-level requirements models.
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December 1, 1995
How does a change in the manning of ships and squadrons at sea affect the Navy's shore-based manning? This question, while hardly new, has arisen recently in several different contexts. One involves cost-effectivness analyses of arsenal ships - which require relatively small crews - as alternatives to traditional surface combatants. The purpose of this paper is to provide a set of empirical estimates of the response of ashore manning to changes in manning of ships and squadrons - hereafter called afloat manning - based on the most recent time-series information available. Over the past six or seven years, the drawdowns in budgets, force structure, and manning have been substantial. Inclusion of that experience in the database from which cost-estimating relationships are developed is essential to the validity of the relationships for use in assessing the cost consequences of decisions presently or soon to be at hand. The analytical construct adopted here is a model that posits delayed adjustment of shore manning to changes in afloat manning.
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November 1, 1992
This paper presents and applies a methodology for estimating the cost of recruiting individuals with alternative distributions of Armed Forces Qualification Test (AFQT) scores. The methodology takes account of the key institutional features of the recruiting process, including recruiter time allocation and procedural guidelines. The method is used to estimate the costs of different recruit-aptitude distributions, using data on applicants and accessions for all of the services.
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March 1, 1992
It is often necessary to estimate the population distribution of a random variate from a sample of observed values. Standard parametric families may not provide satisfactory fit to the data. A polynomial family is constructed by assuming that the distribution function G is a constrained polynomial of the cumulative distribution F of a convenient parametric family. Polynomial families offer great flexibility in data fitting, while retaining the important feature of parametric families that information in the data is condensed into a moderate number of values. This research contribution presents some theory of polynomial families.
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January 1, 1992
The main objective of this study is to identify an improved method for allocating Marine Corps recruiter support funds to the districts. This research memorandum describes a way to account for variation in the average support cost across the Marine Corps recruiting districts. Using FY 1989 and 1990 data, certain variables are found to explain recruiting station support funding costs. Model estimates are made of FY 1992 district support funding requirements. In addition, estimates are made of support cost savings from proposed station consolidations.
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July 1, 1990
This research memorandum presents and applies a methodology for estimating the cost of recruiting individuals with alternative distributions of Armed Forces Qualification Test (AFQT) scores. The methodology takes account of the key institutional features of the recruiting process, including recruiter time allocation and procedural guidelines. The method is used to estimate the costs of different recruit-aptitude distributions, using data on applicants and accessions for all of the services.
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March 1, 1990
This paper presents a mathematical model for two purposes. First, it extends the theoretical analysis of annual contracting to the more general case of uncertainty as to the magnitude of year-two procurement, as opposed simply to its cancellation. The second is to assign parameter values having at least some empirical grounding to the Utgoff-Thaler model, thereby providing a basis for assessing quantitatively the consequences of the theoretical results for both annual and multiyear contracting.
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December 1, 1989
It is common in empirical studies using nonlinear models to estimate the mean response by evaluating the nonlinear response function at the mean value of its argument(s). However, this procedure conceptually is flawed if the response function has significant curvature in the neighborhood of the mean. Ideally, one should evaluate the estimated response function for each of the estimated responses. In general, there will be some nonzero approximation error if one instead simply evaluates the response function at the mean of the independent variable(s). Furthermore, if the variability is significant in the independent variable(s) of interest, the approximation error of using the 'evaluate at the mean' procedure increases. This paper examines the magnitude of the approximation error, and attempts to identify situations in which somewhat more computationally intensive procedures should be used.
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August 1, 1989
This research memorandum describes the approach being used to develop an executable and cost-effective steady-state force. The issues that need to be incorporated into the derivation of a steady-state force model are addressed. The memorandum highlights, by way of examples, numerous ways in which personnel policies and billet structure may be inconsistent, thus making it impossible to execute all policies simultaneously and obtain the required force structure.
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