9e. scatter charts csci n207 data analysis using spreadsheet department of computer and information...
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9e. Scatter Charts
CSCI N207 Data Analysis Using Spreadsheet
Department of Computer and Information Science, IUPUI
Lingma [email protected]
Scatter Chart• Multivariate analysis (involve two variables)• Plots x,y coordinate pairs as points so there are actually two
values associated with a single point on the chart.• Used to illustrate a dependence of one set of values on the
other. • Be able to see if there is a correlation between two variables.
– Positive correlation: one set of values goes up as the other set goes up– Negative correlation: one set of value goes up as the other set goes down– No correlation: no pattern shown
Practice
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Indiana Average Yearly Salary VS. Number of Employement
Total Employement
Avera
ge S
ala
ry• Use the Indiana salary information to find if there is a
correlation between average yearly salary and the total number of employment.
• indianaScatterChart.xlsx
Charts Summary• Given a set of data, what type of graph would
you use?• Generally speaking –
– Column/bar chart: good for comparing series of data on a single variable
– Line chart: good for looking at a trend over a period of time
– Pie chart: good for comparing the percentage– Scatter chart: good for finding the correlation
among two different variables• On same set of data, one can summarize in
different ways, and use different types of chart to convey miscellaneous information
• E.g. multipleCharts.xlsx