Power BI：计算差异列

Question

我在计算矩阵中的差异时遇到了一个问题。例如， 在下图中，您可以看到空白处，差异为 0，而应该为 3。我使用以下公式计算差异：

Diff =
CALCULATE (
    DISTINCTCOUNT ( 'Question and Answer'[Respondent ID] ),
    FILTER (
        'Question and Answer',
        'Question and Answer'[Start Date] = MAX ( 'Question and Answer'[Start Date] )
    )
)
    - CALCULATE (
        DISTINCTCOUNT ( 'Question and Answer'[Respondent ID] ),
        FILTER (
            'Question and Answer',
            'Question and Answer'[Start Date] = MIN ( 'Question and Answer'[Start Date] )
        )
    )

任何帮助将不胜感激。谢谢！

Answer 1

我可能弄错了，但您似乎在计算数据的开始日期和结束日期之间的差异，并按性别过滤。 '而不说'只有一天的数据点，因此它会遵循差异为零。

会发生什么：3-3 = 0。

解决此问题的方法是构建逻辑来评估最小和最大开始日期是否相等，并传入 0 而不是值。

Diff = 
CALCULATE (
    DISTINCTCOUNT ( 'Question and Answer'[Respondent ID] ),
    FILTER (
        'Question and Answer',
        'Question and Answer'[Start Date] = MAX ( 'Question and Answer'[Start Date] )
    )
)
    - **IF(DATEDIFF(MAX('Question and Answer'[Start Date]),MIN('Question and Answer'[Start Date]),DAY) = 0, 0** ,
    
        CALCULATE (
            DISTINCTCOUNT ( 'Question and Answer'[Respondent ID] ),
            FILTER (
                'Question and Answer',
                'Question and Answer'[Start Date] = MIN ( 'Question and Answer'[Start Date] )
            )
        )
    )

两个星号之间的代码行使代码按预期工作。