How can a calculated field be created in Oracle Analytics?

Creating a calculated field in Oracle Analytics is effectively accomplished through the formula editor. The formula editor provides a user-friendly interface where users can define new fields based on existing data using various functions and expressions. This allows for dynamic data manipulation and the ability to derive new insights from the data set by applying calculations that serve specific analytical needs.

Using the formula editor involves specifying calculations, such as sums, averages, or more complex operations, on the data within the analysis. This tool is essential for those looking to enhance their reports or visualizations with additional metrics that aren't directly available as part of the existing data source.

While the other methods described might involve data manipulation or addition, they do not specifically address the process of creating calculated fields directly within the analytics environment. For instance, importing external data sources allows users to bring in new data but does not inherently provide functionality for calculations. Additionally, installing plugins might expand capabilities but is not a direct method for creating calculated fields, and copying existing fields typically just duplicates data rather than allows for new calculations. Thus, the formula editor stands out as the correct method for this task.