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©2011 1www.id-book.com Data analysis, interpretation and presentation Chapter 8
©2011 2www.id-book.com Overview Qualitative and quantitative Simple quantitative analysis Simple qualitative analysis Tools to support data analysis Theoretical frameworks: grounded theory, distributed cognition, activity theory Presenting the findings: rigorous notations, stories, summaries
©2011 3www.id-book.com Quantitative and qualitative Quantitative data – expressed as numbers Qualitative data – difficult to measure sensibly as numbers, e.g. count number of words to measure dissatisfaction Quantitative analysis – numerical methods to ascertain size, magnitude, amount Qualitative analysis – expresses the nature of elements and is represented as themes, patterns, stories Be careful how you manipulate data and numbers!
©2011 4www.id-book.com Simple quantitative analysis Averages –Mean: add up values and divide by number of data points –Median: middle value of data when ranked –Mode: figure that appears most often in the data Percentages Graphical representations give overview of data
©2011 5www.id-book.com Visualizing log data Interaction profiles of players in online game Log of web page activity
©2011 6www.id-book.com Web analytics
©2011 7www.id-book.com Simple qualitative analysis Recurring patterns or themes –Emergent from data, dependent on observation framework if used Categorizing data –Categorization scheme may be emergent or pre-specified Looking for critical incidents –Helps to focus in on key events
©2011 8www.id-book.com Tools to support data analysis Spreadsheet – simple to use, basic graphs Statistical packages, e.g. SPSS Qualitative data analysis tools –Categorization and theme-based analysis, e.g. N6 –Quantitative analysis of text-based data CAQDAS Networking Project, based at the University of Surrey (http://caqdas.soc.surrey.ac.uk/)
©2011 9www.id-book.com Theoretical frameworks for qualitative analysis Basing data analysis around theoretical frameworks provides further insight Three such frameworks are: –Grounded Theory –Distributed Cognition –Activity Theory
© www.id-book.com Grounded Theory Aims to derive theory from systematic analysis of data Based on categorization approach (called here ‘coding’) Three levels of ‘coding’ –Open: identify categories –Axial: flesh out and link to subcategories –Selective: form theoretical scheme Researchers are encouraged to draw on own theoretical backgrounds to inform analysis
© www.id-book.com Distributed Cognition The people, environment & artefacts are regarded as one cognitive system Used for analyzing collaborative work Focuses on information propagation & transformation
© www.id-book.com Activity Theory Explains human behavior in terms of our practical activity with the world Provides a framework that focuses analysis around the concept of an ‘activity’ and helps to identify tensions between the different elements of the system Two key models: one outlines what constitutes an ‘activity’; one models the mediating role of artifacts
© www.id-book.com Individual model
© www.id-book.com Engeström’s (1999) activity system model
© www.id-book.com Presenting the findings Only make claims that your data can support The best way to present your findings depends on the audience, the purpose, and the data gathering and analysis undertaken Graphical representations (as discussed above) may be appropriate for presentation Other techniques are: –Rigorous notations, e.g. UML –Using stories, e.g. to create scenarios –Summarizing the findings
© www.id-book.com Summary The data analysis that can be done depends on the data gathering that was done Qualitative and quantitative data may be gathered from any of the three main data gathering approaches Percentages and averages are commonly used in Interaction Design Mean, median and mode are different kinds of ‘average’ and can have very different answers for the same set of data Grounded Theory, Distributed Cognition and Activity Theory are theoretical frameworks to support data analysis Presentation of the findings should not overstate the evidence
© Done by : Latifa Ebrahim Al Doy Chapter 8 Data analysis, interpretation and presentation and presentation.
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