#### Overview of this book

The Tableau Certified Data Analyst certification validates the essential skills needed to explore, analyze, and present data, propelling your career in data analytics. Whether you're a seasoned Tableau user or just starting out, this comprehensive resource is your roadmap to mastering Tableau and achieving certification success. The book begins by exploring the fundamentals of data analysis, from connecting to various data sources to transforming and cleaning data for meaningful insights. With practical exercises and realistic mock exams, you'll gain hands-on experience that reinforces your understanding of Tableau concepts and prepares you for the challenges of the certification exam. As you progress, expert guidance and clear explanations make it easy to navigate complex topics as each chapter builds upon the last, providing a seamless learning experience—from creating impactful visualizations to managing content on Tableau Cloud. Written by a team of experts, this Tableau book not only helps you pass the certification exam but also equips you with the skills and confidence needed to excel in your career. It is an indispensable resource for unlocking the full potential of Tableau.
Chapter 2: Transforming Data
Chapter 3: Calculations
Chapter 4: Grouping and Filtering
Chapter 5: Charts
Chapter 6: Dashboards
Chapter 7: Formatting
Chapter 8: Publishing and Managing Content
Chapter 9: Accessing the Online Practice Resources
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# Running Sum

A running sum calculation creates a sum of the previous value to the value in the partition, thus accumulating the data points that can show trends or insights in the data.

Figure 3.32: Example of Running Sum

Using a sum is the default option. You can also choose to use an average, minimum, or maximum:

• Average: This option will average the current and previous values
• Minimum and Maximum: These two options will replace the value with either the lowest or highest value in the partition

By setting the Restarting every option, you can select the dimension in the view by which the data is grouped, causing the calculation to restart for each partition defined by that dimension. This is shown in Figure 3.33:

Figure 3.33: Running sum restarting every year

## Difference and Percent of Difference

These functions allow for comparison between data points, highlighting changes in the values and showing either...