You are refererencing column C when you should be referencing column D...
=IF(B3<>"",STDEV(IF($D$3:$D$15=D3,$F$3:$F$15)),"")
confirmed with CTRL+SHIFT+ENTER not just ENTER.
and D3 should be:
=LOOKUP(REPT("z",255),B$3:B3)
copied down.
You are refererencing column C when you should be referencing column D...
=IF(B3<>"",STDEV(IF($D$3:$D$15=D3,$F$3:$F$15)),"")
confirmed with CTRL+SHIFT+ENTER not just ENTER.
and D3 should be:
=LOOKUP(REPT("z",255),B$3:B3)
copied down.
Where there is a will there are many ways.
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