Chart Types Provided by the Show Me Button
Of the many charts available in the Show Me tool in Tableau Public, there are several common chart types that are frequently used. Charts and graphs exist to answer questions, and some charts can naturally answer certain types of questions better than other charts.
Show Me currently contains twenty-three chart types. We expect to see more charts added to in future releases. Advanced charts are normally variations on the basic pallet of the charts you see in Show Me. Now take a look at each chart type provided by Show Me in more detail.
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Text Tables (crosstabs):
The text table (also known as a crosstab) is essentially the same view you would see from an Excel data source or by clicking the View Data button in the Sidebar. The mark type is text, and the data is organized simply into rows and columns.
Text tables look like grids of numbers in a spreadsheet. Crosstabs are useful for looking up values. Figure 3.3 shows a standard crosstab on the left.
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The text table on the right has been enhanced by adding a Boolean calculation to highlight items with less than five percent profit ratio. Individual cells (marks) that are greater than five percent profit ratio are gray.
Text tables (crosstabs) Diagram :
Fig 3.3 Standard crosstab
Maps (Symbol and Filled):
Symbol Maps are simply maps that have a mark displayed over a given Longitude and Latitude. Using the “Marks” card in Tableau you can quickly build up a powerful visual that informs users about their data in relation to its location. You can also use data to drive the shape of the mark that is on the map either by using the Pie chart example or shapes to better show another level of detail.
Filled maps in the Tableau are similar to symbol maps, but they include many more data points. While a symbol map draws a symbol at the intersection of each latitude and longitude pair, filled maps draw a polygon around the entire border.
Selecting a field with a small globe icon makes maps available in Show Me. Figure 3.4 shows examples of the two kinds of maps provided by Show Me.
Symbol map and filled map diagram :
Fig 3.4 : Two kinds of maps provided by Show Me
Symbol maps are most effective for displaying very granular details, or if you need to show multiple members of a small dimension set. In Figure 3.4 Show Me used pie charts to display product category in the map on the left. In Filled maps it is a good idea to make the marks more transparent and add dark borders because marks tend to cluster around highly populated areas. Using the color button on the marks card to do this makes the individual marks easier to see. The color and size legends in view are automatically provided by Tableau. Filled maps display a single measure using color within a geographic shape. If you restrict filled maps to smaller geographic areas (state, province) they effectively display more granular areas like a county or postal code.
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