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ISYS quiz 3

Terms in this set (19)

· Data visualization is the presentation of data in a pictorial or graphical format
· Human brains process information more easily graphically than analytically
o Creating visualizations frequently allows:
§ Trends or patterns in the data to be identified
§ More difficult concepts to be easily grasped
§ The presentation of analyses results
§ Examples of visualization include: charts/graph, interactive charts/graphs, dashboards, infographicsTypes of variables (numerical (discrete, continuous), categorical (nominal, ordinal))
§ Numerical: variables to which a number is assigned as a quantitative value
§ Categorical : variables defined by the classes or categories into which an individual member falls
§ Discrete: reflects a number obtained by counting-no decimal. Gaps between possible values
§ Continuous: reflects a measurement ex: money spent 228.58
§ Nominal: name only (gender male -female, hair color- blond-brown-black
§ Ordinal: nominal categories with an implied order (ex: low, medium, high)Determining what type of chart to use
§ If you have one or more categorical variables to chart, consider
· Sum/count aggregation to product bar/column or clustered/stacked bar/column
· If you have one or more categorical variable and a numerical variable, consider: aggregation to produce bar/column chart or clustered/stacked var/column
· If you have two numerical variables to chart, consider: line graph is one variable has continuous intervals, scatter plot if norther variables is continuous
· To visualize the frequency of words in text: use word cloud
· To visualize data geographically: use map