Research for Applied Statistics
August 1, 1987
The eight-county Allegheny Region of Pennsylvania is 84% forested and comprises one of the state's most valuable timbersheds. Much of this area is inaccessible to conventional logging equipment due to steep slopes, poor drainage, and high erodability. For this reason, there has been a recently growing interest in using cable yarders to harvest these areas. A computer simulation model has been developed to aid in investigating the feasibility of cable logging in this region. This paper explains the design of the model, discusses the field data collected, evaluates the model, and makes recommendations for further data acquisition and model refinement.
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November 1, 1986
The Numerical Operation (NO) subtest, used in the Armed Forces Qualification Test (AFQT), has a history of causing problems for the Armed Services Vocational Aptitude Battery (ASVAB) score scale. Two adjustments to the ASVAB score scale have been required since NO was made part of the AFQT in 1980. The purpose of this report is to present evidence that the NO subtest should be deleted from the AFQT and be replaced by the Math Knowledge (MK) subtest. Data are presented showing that the AFQT scores in 1984 were inflated by approximately three percentile score points.
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November 1, 1986
The Accelerated Computerized Adaptive Testing (CAT) - Armed Services Vocational Aptitude Battery (ASVAB) Project (ACAP) may serve as the pilot version for national implementation of CAT for the ASVAB. Two major decisions in the ACAP involve the introduction of new items into the tests, and setting time limits. This research memorandum takes the position that the long-term benefits which CAT may provide are more important than purely technical concerns and makes recommendations based on this position.
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September 1, 1986
New scales for Armed Services Vocational Aptitude Battery (ASVAB) forms 11, 12, and 13 have been implemented. This research memorandum describes the impact of this adjusted scaling on scores for FY 1985 Marine Corps applicants. In addition, the initial and adjusted scalings for each ASVAB subtest are compared.
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July 1, 1986
This report describes the construction of a new score scale for the Armed Services Vocational Aptitude Battery (ASVAB). The ASVAB was administered to a nationally representative sample of young adults in the fall of 1980. The test scores for this sample were used to construct the new score scale, called the 1980 ASVAB score scale. On 1 October 1984, the 1980 score scale replaced the World War II scale, used by the Department of Defense (DoD) since 1950. The new score scale provides nationally representative test norms that enable DoD personnel and manpower managers to compare the aptitudes of military recruits with those of the potential supply of recruits in the civilian youth population.
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July 1, 1986
The Armed Services Vocational Aptitude Battery (ASVAB) is administered in high schools as part of the Defense Department's recruiting effort. Norms based on a national sample are currently available for grades 11 and 12 only. These were computed from data collected by the National Opinion Research Center (NORC) in 1980. Additional data from a nonrandom sample were collected in 1984 by the Military Entrance Processing Command (MEPCOM). The objectives of the present study were to examine the psychometric appropriateness of using the ASVAB in 9th and 10th grades and to develop norms for these grades. Analysis of appropriateness was based on conventional test and item statistics, and factor analysis. The use of ASVAB in 9th and 10th grades was found to be psychometrically appropriate. Ninth and 10th grade norms were developed by transforming MEPCOM cumulative percentages into national percentile scores. Transformation curves were obtained by combining information from MEPCOM and NORC samples in grades 11 and 12. The average transformation was then used in 9th and 10th grades to convert MEPCOM cumulative percentages into national percentile scores.
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June 1, 1986
Computerized Adaptive Test (CAT) and Paper-and-Pencil (PP) Armed Services Vocational Aptitude Battery (ASVAB) scores are equated in several subpopulations to determine if racial minorities, females, those who did not complete high school, or individuals lacking experience using computers would be at a disadvantage if CAT rather than PP scores were used for selection. Equating is generally independent of population group.
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May 1, 1986
Having been designated as the benchmark for assessing on-the-job performance, hands-on tests need to be examined for the quality of their measurement. This analysis evaluates the measurement validity of hands-on tests based on the results of tests developed for three Marine Corps Military Occupational Specialties (MOS): Ground Radio Repair; Automotive Mechanic; and Infantry Rifleman.
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May 1, 1986
The Armed Forces Qualification Test (AFQT) is currently constructed from a sum of subtest raw scores converted to percentile scores. This paper examines advantages and disadvantages of constructing AFQT percentile scores from sums of subtest standard scores.
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April 1, 1986
Data is presented showing that results on high school ASVAB speeded subtests are inconsistent with results on nonspeeded subtests. Causes for the inconsistencies are explored, and corrective actions based on these findings are recommended.
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