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Related Concept Videos

Measurement: Standard Units03:38

Measurement: Standard Units

Every measurement provides three kinds of information: the size or magnitude of the measurement (a number), a standard of comparison for the measurement (a unit), and an indication of the uncertainty of the measurement. While the number and unit are explicitly represented when a quantity is written, the uncertainty is an aspect of the errors in the measurement results.
Measurement: Derived Units03:02

Measurement: Derived Units

The International System of Units or SI system, by international agreement, has fixed measurement units for seven fundamental properties: length, mass, time, temperature, electric current, amount of substance, and luminosity. These are called the SI base units.
Uncertainty in Measurement: Reading Instruments02:46

Uncertainty in Measurement: Reading Instruments

Counting is the type of measurement that is free from uncertainty, provided the number of objects being counted does not change during the process. Such measurements result in exact numbers. By counting the eggs in a carton, for instance, one can determine exactly how many eggs are there in the carton. Similarly, the numbers of defined quantities are also exact. For example, 1 foot is exactly 12 inches, 1 inch is exactly 2.54 centimeters, and 1 gram is exactly 0.001 kilograms. Quantities...
Accuracy and Precision01:52

Accuracy and Precision

Scientists typically make repeated measurements of a quantity to ensure the quality of their findings and to evaluate both the precision and the accuracy of their results. Measurements are said to be precise if they yield very similar results when repeated in the same manner. A measurement is considered accurate if it yields a result that is very close to the true or the accepted value. Precise values agree with each other; accurate values agree with a true value.  Highly accurate measurements...
Design Example: Measuring Distance Between Two Points with Obstructions01:10

Design Example: Measuring Distance Between Two Points with Obstructions

When measuring distances in areas with physical obstructions, such as a lake in a field, surveyors must employ techniques to calculate accurate lengths without direct line measurements. One effective method is the offset technique, which allows for precise distance estimation over inaccessible stretches.In this scenario, a surveyor must measure a side of an area that crosses a lake. Since the measuring tape cannot span the lake, the surveyor begins by establishing a baseline that aligns with...
Units and Standards of Measurement01:10

Units and Standards of Measurement

A physical quantity is defined either by specifying its measurement method or by stating how it is calculated from other measurements. For example, consider a metallic cube. We might define its mass and dimensions by specifying methods for measuring them, such as using a weighing machine and a meter scale. Then, we could define the volume by stating that it is the cube of its side, and we could calculate the density as the mass divided by the volume.
Measurements of physical quantities are...

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Related Experiment Video

Updated: Jul 4, 2026

Using a Real-Time Locating System to Measure Walking Activity Associated with Wandering Behaviors Among Institutionalized Older Adults
04:13

Using a Real-Time Locating System to Measure Walking Activity Associated with Wandering Behaviors Among Institutionalized Older Adults

Published on: February 8, 2019

Walking and measurement.

David R Bassett1, Matthew T Mahar, David A Rowe

  • 1The University of Tennessee, Knoxville, TN 37996, USA. dbassett@utk.edu

Medicine and Science in Sports and Exercise
|July 17, 2008
PubMed
Summary

Measuring walking accurately is key to understanding its health benefits. Validating measurement tools through definitional, confirmatory, and theory-testing stages ensures reliable research on walking and health outcomes.

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Last Updated: Jul 4, 2026

Using a Real-Time Locating System to Measure Walking Activity Associated with Wandering Behaviors Among Institutionalized Older Adults
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Published on: May 12, 2016

Area of Science:

  • Physical Activity and Health
  • Biomedical Measurement
  • Exercise Science

Background:

  • Walking is a globally practiced, essential physical activity integral to daily life.
  • Evidence increasingly supports walking's crucial role in maintaining good health.
  • Various methods exist for measuring walking, including pedometers, accelerometers, and surveys.

Purpose of the Study:

  • To outline a validation paradigm for walking measurement instruments.
  • To emphasize the multi-stage approach required for robust research validation.
  • To identify future research directions for enhancing knowledge on walking and health.

Main Methods:

  • A three-stage validation paradigm: definitional, confirmatory, and theory-testing.
  • Review of existing theories and empirical evidence on the nature of walking.
  • Examination of how walking relates to other health-related constructs.

Main Results:

  • Validation requires accumulating evidence across definitional, confirmatory, and theory-testing stages.
  • Confirmatory and theory-testing research must build upon earlier definitional research.
  • Conference proceedings highlight the need for advanced research methodologies.

Conclusions:

  • A structured validation process is essential for reliable walking research.
  • Further research is needed to deepen understanding of walking's health impacts.
  • Developing new approaches to promote walking is a key future direction.