我想要Power Bi中的脚本，该脚本将计算从一个月到上个月的百分比增加或减少

问题描述

我希望在选择每个月时显示每个月的总计增加或减少百分比，即当我单击FEB时，它应该告诉我与JAN相比，支出是否有增加/减少的百分比。

I want to display percentage increase or decrease in total for each month as I select each month i.e when I click on FEB, it should tell me whether there was a percentage increase/decrease in expenses compared to JAN.

我尝试了不同的代码，但不断收到错误消息。

I have tried different codes but keep getting an error message.

这是我尝试的DAX代码：

Here is a DAX CODE I tried:

change perc =
VAR ValueLastMONTH =
CALCULATE (
    SUM ( population[TOTAL] ),
    FILTER (
        population,
        population[MONTH]
            = ( EARLIER ( population[MONTH] ) - 1 )
            && population[CATEGORY] = EARLIER ( population[CATEGORY] )

    )
)
RETURN
IF (
    ISBLANK ( ValueLastMONTH ),
    0,
    ( population[TOTAL] - ValueLastMONTH )
        / ValueLastMONTH

我希望创建一个新列来显示从一个月到上个月的百分比增加或减少。
这是excel文档的屏幕截图：

I want a new column created to display the percentage increase or decrease from a month to its previous month.Here is a screenshot of the excel document:

推荐答案

月列的类型不是日期。 PowerBi如何知道APR代表四月的文字？

The Column 'Month' is not of type date. How would PowerBi know the text APR represents April? You need to make this column a date.

现在，您需要更改脚本以与DateDiff一起使用：

Now you need to change the script to work with DateDiff:

change perc = 
VAR ValueLastMONTH =
    CALCULATE (
        SUM ( population[TOTAL] ),
        FILTER (
            population,
            DATEDIFF(population[MONTH], EARLIER ( population[MONTH] ),MONTH) = 1
                && population[CATEGORY] = EARLIER ( population[CATEGORY] )

        )
    )
RETURN
    IF (
        ISBLANK ( ValueLastMONTH );
        0; 
        ( population[TOTAL] - ValueLastMONTH )
            / ValueLastMONTH)

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