Upper- and lower control limit do not appear right - qlikview

Question

Im using the following dataset:
LOAD * INLINE [
Year1, MM1
2012, 23
2013, 25
2014, 27
2015, 30
];
What I want to is create a control chart like-ish line graph. There I've defined Year1 as Dimension and have created the following expressions:
mean -> Avg({<Year1=>} TOTAL Aggr(Sum({<Year1=>}[MM1]), Year1))
lower control -> -(2*Stdev({<Year1=>} TOTAL Aggr(Sum({<Year1=>}[MM1]), Year1)))
upper control -> +(2*Stdev({<Year1=>} TOTAL Aggr(Sum({<Year1=>}[MM1]), Year1)))
The upper- and lower control do not seem to work however (they do appear but not on the right height). Any thoughts on what goes wrong?

Answer 1

I think you need to add the sigma values to the average to get the control limits.
So LCL:
-(2*Stdev({<Year1=>} TOTAL Aggr(Sum({<Year1=>}[MM1]),Year1)))
+Avg({<Year1=>} TOTAL Aggr(Sum({<Year1=>}[MM1]), Year1))**
And UCL:
(2*Stdev({<Year1=>} TOTAL Aggr(Sum({<Year1=>}[MM1]), Year1)))
+Avg({<Year1=>} TOTAL Aggr(Sum({<Year1=>}[MM1]), Year1))**
Then you get this table
And you can draw this graph which matches my understanding of the control chart