DAX建议在PowerBI中生成特定的加权平均度量？

Question

我正在尝试在PowerBi中为调查数据制定加权平均数。 我目前有以下两个表（简化）：

调查数据

ID           How would you score the service?      Do you agree with X?
---------------------------------------------------------------------------
23           Fair                                  Agree
24           Poor                                  Strongly disagree
25           Fair                                  Agree
26           Very poor                             *blank*
27           Very good                             Strongly agree

权重

Weight         Score         Likert
-------------------------------------------------
 1             Very poor     Strongly disagree
 2             Poor          Disagree
 3             Fair          Neither agree nor disagree
 4             Good          Agree
 5             Very good     Strongly Agree

目前， 'surveydata'[How would you score the service?]和'weights'[weight] 。

我尝试计算的加权平均公式如下：

                (x1 * w1) + (x2 * w2) + ... (xn * wn)
Weighted Ave = ___________________________________________
                          x1 + x2 + ... xn

哪里：

w = weight of answer choice
x = response count for answer choice

对于上面的示例，我需要两种度量- 'surveydata'[How would you score the service?]的加权平均值'surveydata'[How would you score the service?]和'surveydata'[How would you score the service?]的加权平均值'surveydata'[Do you agree with X?] 。

对于上面的示例， 'surveydata'[How would you score the service?]的加权平均数应为2.8。

请注意，并发症之一是存在*空白*单元格的事实。

谁能在PowerBI中提出一种通过计算的度量（或其他方法）做到这一点的方法？

Answer 1

您可以将SurveyData表中每一行的权重相加，然后除以行数

Weighted Ave =
DIVIDE(
    SUMX(SurveyData, RELATED(Weights[Weight])),
    COUNTROWS(SurveyData)
)

或者简单地使用平均函数

Weighted Ave = AVERAGEX(SurveyData, RELATED(Weights[Weight]))