CHI2007: Meta-analysis of correlations among usability measurs

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This document summarizes the results of a meta-analysis of correlations between different usability measures. The analysis found: 1) Effectiveness (errors) and efficiency (time) were moderately correlated (r=0.247), explaining 6% of the variance. 2) Effectiveness and satisfaction were weakly correlated (r=0.164), with more satisfied users making fewer errors. 3) Efficiency and satisfaction were also weakly correlated (r=0.196), with preferred interfaces being 20% faster. 4) Correlations between objective and subjective measures of the same construct were not significantly different from zero.

Meta-Analysis of Correlations Among Usability Measures Kasper Hornbæk & Effie Law University of Copenhagen & Eidgenössische Technische Hochschule Zürich

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· define the terms "sample" and "population" and describe some of the advantages and disadvantages of using a sample compared to a population. Support your reasoning with examples. · A researcher is studying the effects of caffeine on exam scores of college students. In this study: · What would be the population and sample of this research? Extrapolate your views of the advantages and disadvantages of samples and populations to this example. · Why would the researcher want to use a sample or a population in this study? · When responding to your classmates' posts, comment on the examples that they provided to illustrate the advantages and disadvantages of a sample compared to a population. What advantages and disadvantages can you add? Justify your answers with appropriate reasoning and research from your textbook and course readings. Health Informatics Research Methods: Principles and Practice, Second Edition Chapter 6: Evaluation Methods © 2017 American Health Information Management Association © 2017 American Health Information Management Association 1 Learning Objectives Demonstrate appropriate use of terms related to evaluation methods and theory. Explain the rationale for conducting an evaluation or evaluation research. Apply evaluation or evaluation research methods to a scenario. Outline the steps in an evaluation of health information technology. © 2017 American Health Information Management Association 2 Introduction: Evaluation and Evaluation Research Evaluation A process to determine perceived value by stakeholders Evaluation research A specific kind of research that includes social science methods and a theoretic framework or model as part of exploratory or hypothesis-driven research © 2017 American Health Information Management Association Evaluation Research Methods Use a theoretic framework Exploratory or hypothesis driven Determine the variables based on theoretic constructs Develop research procedures to study the theoretic constructs Collect and analyze the data © 2017 American Health Information Management Association Forms of Evaluation and Evaluation Research Two categories of evaluation Formative evaluation occurs during the program cycle to gather feedback from stakeholders or end-users to adjust the process or the software so that the desired effects are achieved. Summative evaluation occurs at or near the end of the project and is undertaken to assess effectiveness of the program. © 2017 American Health Information Management Association 5 Formative Evaluation Needs assessment The process of determining, analyzing, and prioritizing needs, and in turn, identifying and implementing solution strategies to resolve high-priority needs Implementation evaluation Monitoring how well the planned events are actually occurring Whether the implementation is meeting the expected timeframes Process evaluation How well the project was carried out © 2017 American Health Information Management Association ...

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