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Related Concept Videos

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...

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Timing accuracy of Web experiments: a case study using the WebExp software package.

Frank Keller1, Subahshini Gunasekharan2, Neil Mayo2

  • 1School of Informatics, University of Edinburgh, 10 Crichton Street, EH8 9AB, Edinburgh, Scotland. frank.keller@ed.ac.uk.

Behavior Research Methods
|February 3, 2009
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Summary
This summary is machine-generated.

WebExp software enables reliable collection of internet-based response time data for psychological studies. This online tool accurately measures response latencies, validating its use in research.

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Area of Science:

  • Psychology
  • Human-Computer Interaction
  • Computational Linguistics

Background:

  • Internet-based experiments are increasingly common in research.
  • Most online studies focus on response accuracy, not response times.
  • Collecting precise response latency data online presents technical challenges.

Purpose of the Study:

  • To demonstrate the feasibility of collecting response latency data via the World-Wide Web.
  • To introduce and evaluate WebExp, a software package for internet-based psychological experiments.
  • To validate the accuracy and reliability of WebExp for response time measurements.

Main Methods:

  • Experiment 1: Measured known time intervals using keyboard repetition via WebExp to assess accuracy.
  • Experiment 2: Replicated a lab-based self-paced reading study using WebExp to compare online and offline data.
  • Utilized WebExp software for all internet-based data collection.

Main Results:

  • Experiment 1 showed accurate time interval measurements across different platforms and system loads.
  • Experiment 2's online replication data significantly correlated with the original lab-based study.
  • The online replication using WebExp reproduced the main effects and interactions found in the original study.

Conclusions:

  • WebExp is a feasible and reliable tool for collecting response time data over the internet.
  • The software demonstrates accuracy comparable to traditional lab-based measurements for specific paradigms.
  • Findings support the use of WebExp for online psycholinguistic research, particularly self-paced reading.