如何根据分组变量计算 Power Query 中的百分位数？

Question

我有几列数据，我需要将"PERCENTILE"的excel版本转换成Powerquery格式。

我有一些代码作为函数添加，但应用不准确，因为它不允许按类别和年份对数据进行分组。因此，完全自由裁量 1.5-2.5 和 2014 中的任何内容都需要添加到百分位数数组中，同样，完全自由裁量 2.5-3.5 和 2014 中的任何内容都需要进入不同的百分位数数组

let

 Source = (list as any, k as number) => let

 Source = list,

 #"Converted to Table" = Table.FromList(Source, Splitter.SplitByNothing(), null, null, ExtraValues.Error),

 #"Sorted Rows" = Table.Sort(#"Converted to Table",{{"Column1", Order.Ascending}}),

 #"Added Index" = Table.AddIndexColumn(#"Sorted Rows", "Index", 1, 1),

 #"Added Custom" = Table.AddColumn(#"Added Index", "TheIndex", each Table.RowCount(#"Converted to Table")*k/100),

 #"Filtered Rows" = Table.SelectRows(#"Added Custom", each [Index] >= [TheIndex] and [Index] <= [TheIndex]+1),

Custom1 = List.Average(#"Filtered Rows"[Column1])

   in

 Custom1

in

 Source

所以预期的结果是，在 2 列（年份、类别）上匹配的任何内容都应该应用到同一个数组中。当前调用上述函数只会给我错误。我也尝试过使用分组并输出 "Min, Median, and Max" 输出，但我还需要 10% 和 90% 的百分位数。

提前致谢

Answer 1

基于其他网站上的一些发现和大量谷歌搜索（大多数人只想使用 DAX，但如果你只使用 Power Query，你就不能！）有人发布了一个非常有帮助的答案：

https://social.technet.microsoft.com/Forums/en-US/a57bfbea-52d1-4231-b2de-fa993d9bb4c9/can-the-quotpercentilequot-be-calculated-in-power-query?forum=powerquery

基本上：

/PercentileInclusive Function

(inputSeries as list, percentile as number) => 
let
    SeriesCount = List.Count(inputSeries),
    PercentileRank = percentile*(SeriesCount-1)+1, //percentile value between 0 and 1
    PercentileRankRoundedUp = Number.RoundUp(PercentileRank),
    PercentileRankRoundedDown = Number.RoundDown(PercentileRank),
    Percentile1 = List.Max(List.MinN(inputSeries,PercentileRankRoundedDown)),
    Percentile2 = List.Max(List.MinN(inputSeries,PercentileRankRoundedUp)),
    Percentile = Percentile1+(Percentile2-Percentile1)*(PercentileRank-PercentileRankRoundedDown)
in
    Percentile

以上将复制在 Excel 中找到的 PERCENTILE 函数 - 您使用 "New Query" 和高级编辑器将其作为查询传递。然后在对数据进行分组后调用它 -

Table.Group(RenamedColumns, {"Country"}, {{"Sales Total", each List.Sum([Amount Sales]), type number}, {"95 Percentile Sales", each List.Average([Amount Sales]), type number}})

In the above formula, RenamedColumns is the name of the previous step in the script. Change the name to match your actual case. I've assumed that the pre-grouping sales amount column is "Amount Sales." Names of grouped columns are "Sales Total" and "95 Percentile Sales."

Next modify the group formula, substituting List.Average with PercentileInclusive:

Table.Group(RenamedColumns, {"Country"}, {{"Sales Total", each List.Sum([Amount Sales]), type number}, {"95 Percentile Sales", each PercentileInclusive([Amount Sales],0.95), type number}})

这适用于我的数据集并且匹配相似

如何根据分组变量计算 Power Query 中的百分位数？

How do I calculate Percentiles in PowerQuery based on grouping variables?

excel

percentile

powerquery