创建每周6个月的滚动平均值过滤条件 [英] Create 6 months rolling average on week filter

问题描述

我正在尝试创建一个报告，该报告应该提供每周数据，还应提供一个列，用于滚动显示6个月到上个月和去年同期。

I am trying to create a report, which should give weekly data but also a column for rolling 6 months till the last month and the same period last year.

我可以使用以下公式计算滚动平均值：

I am able to calculate the rolling average using the formula below:

6 months rolling =
VAR period_end = 
    CALCULATE(
        MAX('Dimensions'[Month Start Date]),
        FILTER(
            ALL('Dimensions'[Year Week]),
            'Dimensions'[Year Week]=SELECTEDVALUE('Dimensions'[Year Week])
        )
    )

VAR period_till = 
    FIRSTDATE( 
        DATESINPERIOD(
            'Dimensions'[Month Start Date], 
            period_end, 
            -1, 
            MONTH
        )
    )

VAR period_start = 
    FIRSTDATE( 
        DATESINPERIOD(
            'Dimensions'[Month Start Date], 
            period_till, 
            -6, 
            MONTH
        )
    )

RETURN
    CALCULATE(
        SUM(Total_Sales),
        DATESBETWEEN(
            [Month Start Date], 
            period_start, 
            period_till
        )
    )

出现数据很好，但是一旦我在[Year Week]上放了一个切片器，它就会开始提供每周数据，而不是滚动平均值。

The data comes up fine but as soon as i put a slicer on the [Year Week], it starts giving the weekly data, rather than Rolling average.

我想我需要使用ALL过滤器，但是我的努力还没有得到回报。感谢所有帮助。

I think i need to use ALL filter but my efforts haven't paid off on it too yet. Appreciate any help on this.

报告结构如下：

类别

Category

Current_Week_Data

Current_Week_Data

上一年同一周的数据

差异％

滚动6个月（今年-前6年6个月/上一年6个月）

rolling 6 months (this year - previous 6 year 6 months /previous year 6 months)

推荐答案

我认为这可以解决问题。如果我们在12月（如现在），则将对今年以及去年6月至11月的数据 [X]求和，然后计算出分数变化。明智的做法是，切片器不会在[Year Week]上受到影响

I think this will do the trick. If we are in Dec (as now) it will sum 'Data'[X] for June-Nov this year as well as last year, and then calculate the fractional change. It will not be affected, calculation wise, by a slicer on [Year Week]

Rolling n month average = 
var n = 7 //number of months looking back
var currentDate = MAX('Calendar'[Date]) // max date in current context
var startDate = EOMONTH(EDATE(currentDate; -n);0) // end date of the 7th month back
var currentDateLY = currentDate-364 // Monday -> Monday, use 365 if date match is more important. Using 365 also removes strange values in the beginning/end of months.
var startDateLY = EOMONTH(EDATE(currentDateLY; -n); 0)

var theDataTY = // the data This Year
CALCULATE(
    SUM('Data'[X]);
    ALL('Calendar'[Year Week]);
    FILTER(
        ALL('Calendar'[Date]);
        'Calendar'[Date] > ( startDate ) && 'Calendar'[Date] <DATE(YEAR(currentDate);MONTH(currentDate);1) // the 6 month interval 
    )
)
var theDataLY = // the data Last Year
CALCULATE(
    SUM('Data'[X]);
    ALL('Calendar'[Year Week]);
    FILTER(
        ALL('Calendar'[Date]);
        'Calendar'[Date] > ( startDateLY ) && 'Calendar'[Date] <DATE(YEAR(currentDateLY);MONTH(currentDateLY);1) // the 6 month period last year
    )
)

return
DIVIDE( // calculate the fractional change
    theDataTY - theDataLY;
    theDataLY;
    0 // returns 0 if fraction is not defined. 
)

我有两个桌子设置：日历和数据。 日历 [日期]和数据 [日期]之间存在1 ::的关系。另外，我毫不怀疑在DAX中有更好的方法可以做到这一点，这就是我会做到的方式。

I have two tables in my setup: 'Calendar' and 'Data'. There's a 1:* relationship between 'Calendar'[Date] and 'Data'[Date]. Also, I have no doubt that there is a better way of doing this in DAX, this is just how I would have done it.

希望这会有所帮助。

干杯，

奥斯卡

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