Conditional Standard Deviation

[yongshun]

I wish to calculate the standard deviation of Brand A Product 1-5 and Brand B Product 1-5.
Is there any shortcut for this?
I call this a brand pairing and I have 300 brand pairing to be done. Help is needed! [TABLE="width: 500"]
<tbody>[TR]
[TD]Brand[/TD]
[TD]Product[/TD]
[TD]Demand[/TD]
[/TR]
[TR]
[TD]A[/TD]
[TD]1[/TD]
[TD]3[/TD]
[/TR]
[TR]
[TD]A[/TD]
[TD]2[/TD]
[TD]4[/TD]
[/TR]
[TR]
[TD]A[/TD]
[TD]3[/TD]
[TD]12[/TD]
[/TR]
[TR]
[TD]A[/TD]
[TD]4[/TD]
[TD]35[/TD]
[/TR]
[TR]
[TD]A[/TD]
[TD]5[/TD]
[TD]6[/TD]
[/TR]
[TR]
[TD]A[/TD]
[TD]6[/TD]
[TD]8[/TD]
[/TR]
[TR]
[TD]A[/TD]
[TD]7[/TD]
[TD]9[/TD]
[/TR]
[TR]
[TD]A[/TD]
[TD]8[/TD]
[TD]5[/TD]
[/TR]
[TR]
[TD]A[/TD]
[TD]9[/TD]
[TD]6[/TD]
[/TR]
[TR]
[TD]A[/TD]
[TD]10[/TD]
[TD]7[/TD]
[/TR]
[TR]
[TD]B[/TD]
[TD]1[/TD]
[TD]10[/TD]
[/TR]
[TR]
[TD]B[/TD]
[TD]2[/TD]
[TD]12[/TD]
[/TR]
[TR]
[TD]B[/TD]
[TD]3[/TD]
[TD]3[/TD]
[/TR]
[TR]
[TD]B[/TD]
[TD]4[/TD]
[TD]4[/TD]
[/TR]
[TR]
[TD]B[/TD]
[TD]5[/TD]
[TD]6[/TD]
[/TR]
[TR]
[TD]B[/TD]
[TD]6[/TD]
[TD]3[/TD]
[/TR]
[TR]
[TD]B[/TD]
[TD]7[/TD]
[TD]67[/TD]
[/TR]
[TR]
[TD]B[/TD]
[TD]8[/TD]
[TD]9[/TD]
[/TR]
[TR]
[TD]B[/TD]
[TD]9[/TD]
[TD]5[/TD]
[/TR]
</tbody>[/TABLE]

 

[joeu2004]

Since everything is ordered, the simplest formulas are:

Brand A: =STDEVP(C2:C6)
Brank B: =STDEVP(C12:C16)

But I presume you are looking for something more general.

Array-enter (press ctrl+shift+Enter instead of just Enter) the following formulas:

Brand A: =STDEVP(IF($A$2:$A$20="A",IF($B$2:$B$20={1,2,3,4,5},$C$2:$C$20)))
Brand B: =STDEVP(IF($A$2:$A$20="B",IF($B$2:$B$20={1,2,3,4,5},$C$2:$C$20)))