尝试在 MDX 中计算四分位数答案

【问题标题】：Trying to calculate quartiles in MDX尝试在 MDX 中计算四分位数
【发布时间】：2015-08-31 05:33:10
【问题描述】：

我的数据如下所示：

ID                                   |PersonID  |CompanyID  |DateID  |Throughput |AmountType
33F467AC-F35B-4F24-A05B-FC35CF005981 |7         |53         |200802  |3          |0
04EE0FF0-511D-48F5-AA58-7600B3A69695 |18        |4          |201309  |5          |0
AB058AA5-6228-4E7C-9469-55827A5A34C3 |25        |69         |201108  |266        |0

大约有一百万行。列名 *ID 引用其他表，因此它们可以用作维度。

我有一个 OLAP 多维数据集，其中吞吐量列作为度量，其余作为维度。

我想计算吞吐量度量的四分位数 1 和 3。

我遵循了这个指南：https://electrovoid.wordpress.com/2011/06/24/ssas-quartile/ 连同这个帖子：Calculating Quartiles in Analysis Services

来自我尝试使用此 MDX 查询的人：

WITH
SET selection as ([Dates].[Year].&[2014],[Dates].[Month].&[1])  

SET [NonEmptyIds] AS
 NonEmpty(
      [ThroughputID].[ID].[id]
   *[ThroughputID].[ID].[Id].ALLMEMBERS
  ,
  {[Measures].[Throughput]} * [selection]
 )
 SET [ThroughputData] AS 
ORDER
    (    
        [NonEmptyIds],  
        [Measures].[Throughput], 
        BASC
     )
MEMBER [Measures].[RowCount] AS COUNT (ThroughputData)
MEMBER [Measures].[i25] AS ( .25 *  ( [RowCount] - 1 ) ) + 1
MEMBER [Measures].[i25Lo] AS FIX([i25])   - 1
MEMBER [Measures].[i25Rem] AS ([i25] - FIX([i25]))
MEMBER [Measures].[n25Lo] AS (ThroughputData.Item([i25Lo]), [Throughput])
MEMBER [Measures].[n25Hi] AS (ThroughputData.Item([i25Lo] + 1), [Throughput])
MEMBER [Measures].[Quartile1] AS [n25Lo] + ( [i25Rem] * ( [n25Hi] - [Throughput] ))

SELECT
selection ON 0,
[Measures].[Quartile1]
ON 1
FROM (SELECT [Dates].[Y-H-Q-M].MEMBERS ON 0 FROM [Throughput])

但我得到：'Query (6, 7) ID 层次结构在 Crossjoin 函数中被多次使用。'

我对 OLAP 和 MDX 很陌生。任何想法有什么问题以及我应该如何正确计算四分位数？

我在某处读到，在计算四分位数时，我需要 ID 维度才能获得包含所有值而不是聚合值的集合...

【问题讨论】：

顺便说一句-我认为您可以简化此脚本，将子选择 FROM (SELECT [Dates].[Y-H-Q-M].MEMBERS ON 0 FROM [Throughput]) 删除为 FROM [Throughput]

标签： mdx cross-join quartile

【解决方案1】：

罪魁祸首是下面这段代码：

SET [NonEmptyIds] AS
 NonEmpty(
      [ThroughputID].[ID].[id]
   *[ThroughputID].[ID].[Id].ALLMEMBERS
  ,
  {[Measures].[Throughput]} * [selection]
 )

您不能在交叉连接中多次使用相同的层次结构。在这里，您使用了两次[ThroughputID].[ID]。请尝试以下方法：

SET [NonEmptyIds] AS
 NonEmpty(
      [ThroughputID].[ID].[Id].ALLMEMBERS
  ,
  {[Measures].[Throughput]} * [selection]
 )

【讨论】：