Tibco Spotfire - 仅在列中有最少3个值的情况下才计算平均值 - 请参阅desc

Question

我想仅在存在最小3个值时才计算Spotfire的平均值。如果没有价值，或只是2个值的平均值应为空白

原始数据：

Product  Age   Average 
1 
2 
3    10  
4    12 
5    13    11 
6 
7    18 
8    19 
9    20    19 
10   21    20 

Answer 1

我真的可以做到这一点的唯一方法是用3计算列。顺序插入这些计算列：

• If(Min(If([Age] IS NULL,0,[Age])) over (LastPeriods(3,[Product]))<>0,1) as [BitFlag]
• Avg([Age]) over (LastPeriods(3,[Product])) as [TempAvg]
• If([BitFlag]=1,[TempAvg]) as [Average]

这会给你下面的结果。您可以忽略/隐藏您不关心的两列。

成绩

+---------+-----+---------+------------------+------------------+ 
| Product | Age | BitFlag |  TempAvg  |  Average  | 
+---------+-----+---------+------------------+------------------+ 
|  1 |  |   |     |     | 
|  2 |  |   |     |     | 
|  3 | 10 |   |    10 |     | 
|  4 | 12 |   |    11 |     | 
|  5 | 13 |  1 | 11.6666666666667 | 11.6666666666667 | 
|  6 |  |   |    12.5 |     | 
|  7 | 18 |   |    15.5 |     | 
|  8 | 19 |   |    18.5 |     | 
|  9 | 20 |  1 |    19 |    19 | 
|  10 | 21 |  1 |    20 |    20 | 
|  11 |  |   |    20.5 |     | 
|  12 | 22 |   |    21.5 |     | 
|  13 | 36 |   |    29 |     | 
|  14 |  |   |    29 |     | 
|  15 | 11 |   |    23.5 |     | 
|  16 | 23 |   |    17 |     | 
|  17 | 14 |  1 |    16 |    16 | 
+---------+-----+---------+------------------+------------------+