28-03-2021

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A decision tree is a decision support tool that uses a tree-like graph or model of decisions and their possible consequences, including chance event outcomes, resource costs, and utility. Decision trees are widely used in areas like operations research, specifically in decision analysis, to help identify a strategy most likely to reach a goal.

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If you are a Tableau User/Developer, you might have struggled to create a decision tree, especially when it comes to integrating the real data with the decision tree nodes.

In this post I would like to share an approach to create a Dynamic Decision Tree in Tableau with real data integration.

As we all know there is no inbuilt Decision Tree template available in Tableau, but there are many ways to create a decision tree by making few change in the normal Tableau development workflow.

I will explain my approach of creating Decision Tree from the perspective of Data Preparation, Visualization and formatting.

Data Preparation

There are two sets of data sources, one is for the node position data and the other one is for the actual values to be integrated for each nodes.

Table A: sample data which defines the tree node positions.

Table B: sample data to be integrated with each nodes. The data can be extended to more insight as per the requirement.

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Key Points in Tableau Dashboard Design

  • The Tableau dashboard contains N sheets depending on number of hierarchy Levels.
  • Each Tableau sheet will be developed from individual data connection. All data connection will have same schema.
  • Each parent sheet will be having an action filter (in context) to the immediate child sheet.
  • Create two calculation fields as below in each connections,
  • Temp :”Temp”
  • Hierarchy Filter : { FIXED [Temp]: COUNTD([Parent])}
  • Add the Hierarchy Filter calculation field into filter deck of each sheets and set the at most option to 1.
  • Set the background image for each sheet based on the parent node and adjust its position.

The background Images can be designed using coral draw or paint.

Color Coding and Formatting

Following are the calculation fields used in color coding and formatting the tool-tip option,

  • Coloring: The formula is,

if avg([Actual]) > avg([Target])
then
'Crossed Target'
ELSEIF avg([Actual])avg([Target])
then
'Below Target'
ELSE
'Target Met'
END

  • Target Tool Tip:The formula is, LEFT('█████████████████████████████████████████████████████████████████',ROUND(AVG([Target])*[Ratio],0))
  • Actual Tool Tip: The formula is, LEFT('█████████████████████████████████████████████████████████████████',ROUND(AVG([Actual])*[Ratio],0))

Conclusion

I here by concluding that the above given approach of creating decision tree is very flexible to integrate with any volume of data with any number of hierarchy.

You may please find the final output from Dynamic Decision Tree in Tableau

For further details reach me at vinnasraj@outlook.com

Special Thanks To,

Vijayabalan

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This article provides workaround for the problem that occurs in the ODBC Data Source Administrator tool.

Original product version: SQL Server
Original KB number: 942976

Symptoms

A 64-bit version of the Microsoft Windows operating system includes the following versions of the ODBC Data Source Administrator tool (Odbcad32.exe):

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  • The 32-bit version of the Odbcad32.exe file is located in the %systemdrive%WindowsSysWoW64 folder.
  • The 64-bit version of the Odbcad32.exe file is located in the %systemdrive%WindowsSystem32 folder.

The Odbcad32.exe file displays the following types of data source names (DSNs):

  • System DSNs
  • User DSNs

Symptom 1

The 32-bit version of the ODBC Administrator tool displays 32-bit system DSNs, 32-bit user DSNs, and 64-bit user DSNs. The 64-bit version of the ODBC Administrator tool displays 64-bit system DSNs, 32-bit user DSNs, and 64-bit user DSNs.

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Symptom 2

The SQLDataSources function returns all versions of user DSNs, regardless of the architecture of the application. The SQLDataSources function that is called in a 32-bit application returns only system DSNs for 32-bit drivers but returns user DSNs for both 32-bit drivers and 64-bit drivers. Similarly, the SQLDataSources function that is called in a 64-bit application returns only system DSNs for 64-bit drivers but returns user DSNs for both 32-bit drivers and 64-bit drivers. Therefore, if the application makes a connection by using a user DSN that is returned from the SQLDataSources function, you may receive the following error message:

Data source name not found and no default driver specified

For example, consider the following scenario. You create a user DSN for the 32-bit driver 'Microsoft Access Driver (*.mdb)'. This driver does not have a corresponding 64-bit version. The SQLDataSources function that is called in a 64-bit application returns this 32-bit user DSN. However, if you make a connection through this 32-bit user DSN, you receive the error message that is mentioned earlier in this section.

Cause

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The user DSNs are stored under the following registry subkey:

HKEY_CURRENT_USERSoftwareODBCODBC.INI

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Registry redirection is not enabled for this registry subkey. Therefore, user DSNs are visible in both the 32-bit and 64-bit versions of the ODBC Administrator tool.

Resolution

To maintain backward compatibility, no resolution for this problem is currently available.

Driver

Workaround

To work around this problem, use the appropriate version of the ODBC Administrator tool. If you build and then run an application as a 32-bit application on a 64-bit operating system, you must create the ODBC data source by using the ODBC Administrator tool in %windir%SysWOW64odbcad32.exe. To indicate the type of DSN, you can add '_32' to the 32-bit user DSNs and '_64' to the 64-bit user DSNs.

More information

The 64-bit ODBC Administrator tool can be invoked from Control Panel to manage user DSNs and system DSNs that are used by 64-bit processes. On a 64-bit operating system, the 32-bit ODBC Administrator tool is used for Windows on Windows 64 (WOW64) processes. You must directly invoke the 32-bit ODBC Administrator tool from the SysWoW64 folder. You can use the 32-bit ODBC Administrator tool to manage user DSNs and system DSNs that are used by WOW64 processes.

System DSNs are stored in the following registry subkey:

HKEY_LOCAL_MACHINESoftwareODBCODBC.INI

Registry redirection is enabled for this registry subkey. Therefore, system DSNs for 32-bit drivers and for 64-bit drivers are separated. The 64-bit ODBC Administrator tool does not display system DSNs that are created by the 32-bit ODBC Administrator tool. Similarly, the 32-bit ODBC Administrator tool does not display system DSNs that are created by the 64-bit ODBC Administrator tool. Also, the 64-bit ODBC Administrator tool does not display system DSNs that use 32-bit drivers. Similarly, the 32-bit ODBC Administrator tool does not display system DSNs that use 64-bit drivers.

User DSNs are stored in the following registry subkey:

HKEY_CURRENT_USERSoftwareODBCODBC.INI

Registry redirection is not enabled for this registry subkey. Therefore, both ODBC Administrator tools display all user DSNs.

For more information about registry redirection, see Registry Redirector.