What is a key requirement for the input worksheet when using the trend function?

The key requirement for the input worksheet when using the trend function is that the first column must uniquely identify records. This unique identification is essential because it allows the trend function to accurately associate each numeric value with its corresponding record based on the identifiers in the first column.

When the first column serves as a unique identifier, it ensures that each record is distinguishable, allowing the trend function to analyze and predict values effectively based on the distinct groups or categories represented. This capability is critical for generating reliable trends, as it prevents confusion between records and supports the integrity of the data analysis.

In contrast, the other requirements, such as having only numeric values, listing only dates, or requiring that each date has a unique money value, do not fundamentally establish the context necessary for the trend function to operate correctly. While there may be specific scenarios where those conditions might be relevant, they do not capture the core necessity of unique identification for accurate data interpretation and analysis in the context of using the trend function.