00464595

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http://onlinepubs.trb.org...trr/1987/1111/1111-006.pdf

https://scholar.google.co...rros&publication_year=1987

Regression analysis is frequently used in the engineering field to develop mathematical models for a wide variety of applications. Of the several assumptions upon which regression theory is based, one of the most fundamental is that the X-values are known exactly and that any error is associated only with the Y-measurements. Because this is not the case for many engineering applications, a study was conducted (a) to determine the magnitude of this problem and (b) to develop and test a software package that incorporates a theoretical solution found in the literature. Computer simulation is used to demonstrate both the seriousness of the problem and the effectiveness of the solution. An example based on early strength tests of concrete is presented.

Publication of this paper sponsored by Committee on Methodology for Evaluating Highway Improvements. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved

00496549

pp 48-54

1987

Transportation Research Record

0-309-04463-4

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Figures (4) ; References (3) ; Tables (5)

Concrete; Concrete tests; Engineering; Errors; Mathematical models; Regression analysis; Simulation; Software; Strength of materials; Theory; Variables

Data and Information Technology; Highways; Materials; Safety and Human Factors; I32: Concrete

TRIS, TRB

Dec 31 1987 12:00AM

• A METHOD OF CALCULATING THE EFFECTIVE INTENSITY OF MULTIPLE-FLICK FLASHTUBE SIGNALS
• A STUDY OF ROUTE SELECTION FROM HIGHWAY MAPS (ABRIDGMENT)
• ADVISORY SPEED SIGNS AND CURVE SIGNS AND THEIR EFFECT ON DRIVER EYE SCANNING AND DRIVING PERFORMANCE
• ALTERNATIVES TO ENFORCEMENT IN MODIFYING THE SPEEDING BEHAVIOR OF DRIVERS
• ANALYSIS OF HIGH-HAZARD LOCATIONS: IS AN EXPERT SYSTEMS APPROACH FEASIBLE?
• CRASH REVISITED: ADDITIONS TO ITS CLARITY, GENERALITY, AND UTILITY
• EVALUATION OF ALTERNATIVE SIGN-LIGHTING SYSTEMS TO REDUCE OPERATING AND MAINTENANCE COSTS (DISCUSSION AND CLOSURE)
• EVALUATION OF OPPORTUNITY-BASED ACCIDENT RATE EXPRESSIONS
• EVALUATION OF THE EFFECTIVENESS OF CRASH CUSHION DELINEATION
• EXCESS TRAVEL: CAUSES, EXTENT, AND CONSEQUENCES
• RELATIONSHIPS BETWEEN VERTICAL AND HORIZONTAL ROADWAY ALIGNMENTS AND THE INCIDENCE OF FATAL ROLLOVER CRASHES IN NEW MEXICO AND GEORGIA
• SAFETY IMPLICATIONS OF TRUCK CONFIGURATION
• SPECIAL TRAFFIC CONTROL TO MEET MOTORIST INFORMATION NEEDS ON LONG, STEEP GRADES (DISCUSSION AND CLOSURE)
• STANDARD TARGET CONTRAST: A VISIBILITY PARAMETER BEYOND LUMINANCE TO EVALUATE THE QUALITY OF ROADWAY LIGHTING
• VALIDATION OF A NONAUTOMATED SPEED DATA COLLECTION METHODOLOGY
• VIDEO COLLISION RECONSTRUCTION USING PHYSICAL EVIDENCE