1. 9e. Scatter Charts CSCI N207 Data Analysis Using Spreadsheet Department of Computer and Information Science, IUPUI Lingma Acheson linglu@iupui.edu

2. 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

3. Practice Use the Indiana salary information to find if there is a correlation between average yearly salary and the total number of employment. indianaScatterChart.xlsx

4. 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